diff --git a/src/urh/ui/ui_modulation.py b/src/urh/ui/ui_modulation.py
index 89e4973c..b1efb9e4 100644
--- a/src/urh/ui/ui_modulation.py
+++ b/src/urh/ui/ui_modulation.py
@@ -20,7 +20,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.lPlus.sizePolicy().hasHeightForWidth())
         self.lPlus.setSizePolicy(sizePolicy)
-        self.lPlus.setMinimumSize(QtCore.QSize(30, 30))
         self.lPlus.setMaximumSize(QtCore.QSize(30, 30))
         self.lPlus.setText("")
         self.lPlus.setPixmap(QtGui.QPixmap(":/icons/data/icons/plus.png"))
@@ -120,7 +119,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.linEdDataBits.sizePolicy().hasHeightForWidth())
         self.linEdDataBits.setSizePolicy(sizePolicy)
-        self.linEdDataBits.setMinimumSize(QtCore.QSize(227, 0))
         self.linEdDataBits.setObjectName("linEdDataBits")
         self.gridLayout_2.addWidget(self.linEdDataBits, 0, 0, 1, 2)
         self.label = QtWidgets.QLabel(DialogModulation)
@@ -196,8 +194,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.treeViewSignals.sizePolicy().hasHeightForWidth())
         self.treeViewSignals.setSizePolicy(sizePolicy)
-        self.treeViewSignals.setMinimumSize(QtCore.QSize(0, 0))
-        self.treeViewSignals.setMaximumSize(QtCore.QSize(16777215, 16777215))
         self.treeViewSignals.setProperty("showDropIndicator", True)
         self.treeViewSignals.setDragEnabled(True)
         self.treeViewSignals.setDragDropMode(QtWidgets.QAbstractItemView.DragOnly)
@@ -222,7 +218,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.btnSearchPrev.sizePolicy().hasHeightForWidth())
         self.btnSearchPrev.setSizePolicy(sizePolicy)
-        self.btnSearchPrev.setMinimumSize(QtCore.QSize(0, 0))
         self.btnSearchPrev.setMaximumSize(QtCore.QSize(16777215, 16777215))
         self.btnSearchPrev.setText("")
         icon = QtGui.QIcon.fromTheme("go-previous")
@@ -246,7 +241,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.lSlash.sizePolicy().hasHeightForWidth())
         self.lSlash.setSizePolicy(sizePolicy)
-        self.lSlash.setMinimumSize(QtCore.QSize(7, 0))
         self.lSlash.setMaximumSize(QtCore.QSize(7, 16777215))
         self.lSlash.setObjectName("lSlash")
         self.gridLayout_4.addWidget(self.lSlash, 0, 2, 1, 1)
@@ -266,7 +260,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.btnSearchNext.sizePolicy().hasHeightForWidth())
         self.btnSearchNext.setSizePolicy(sizePolicy)
-        self.btnSearchNext.setMinimumSize(QtCore.QSize(0, 0))
         self.btnSearchNext.setMaximumSize(QtCore.QSize(16777215, 16777215))
         self.btnSearchNext.setText("")
         icon = QtGui.QIcon.fromTheme("go-next")
@@ -288,7 +281,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.lSamplesInViewOrigSignal.sizePolicy().hasHeightForWidth())
         self.lSamplesInViewOrigSignal.setSizePolicy(sizePolicy)
-        self.lSamplesInViewOrigSignal.setMinimumSize(QtCore.QSize(100, 0))
         self.lSamplesInViewOrigSignal.setObjectName("lSamplesInViewOrigSignal")
         self.gridLayout_6.addWidget(self.lSamplesInViewOrigSignal, 3, 1, 1, 1)
         self.label_10 = QtWidgets.QLabel(DialogModulation)
@@ -302,7 +294,6 @@ class Ui_DialogModulation(object):
         self.btnSaveAndClose.setObjectName("btnSaveAndClose")
         self.gridLayout_7.addWidget(self.btnSaveAndClose, 9, 0, 1, 2)
         self.gVOriginalSignal = ZoomAndDropableGraphicView(DialogModulation)
-        self.gVOriginalSignal.setMinimumSize(QtCore.QSize(0, 100))
         self.gVOriginalSignal.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
         self.gVOriginalSignal.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
         self.gVOriginalSignal.setRenderHints(QtGui.QPainter.Antialiasing|QtGui.QPainter.HighQualityAntialiasing)
@@ -328,7 +319,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.gVData.sizePolicy().hasHeightForWidth())
         self.gVData.setSizePolicy(sizePolicy)
-        self.gVData.setMaximumSize(QtCore.QSize(16777215, 100))
         self.gVData.setAcceptDrops(False)
         self.gVData.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
         self.gVData.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
@@ -337,7 +327,6 @@ class Ui_DialogModulation(object):
         self.gVData.setObjectName("gVData")
         self.gridLayout_7.addWidget(self.gVData, 4, 1, 1, 1)
         self.gVCarrier = ZoomableGraphicView(DialogModulation)
-        self.gVCarrier.setMaximumSize(QtCore.QSize(16777215, 100))
         self.gVCarrier.setAcceptDrops(False)
         self.gVCarrier.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
         self.gVCarrier.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
@@ -351,7 +340,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.lEqual.sizePolicy().hasHeightForWidth())
         self.lEqual.setSizePolicy(sizePolicy)
-        self.lEqual.setMinimumSize(QtCore.QSize(30, 30))
         self.lEqual.setMaximumSize(QtCore.QSize(30, 30))
         self.lEqual.setText("")
         self.lEqual.setPixmap(QtGui.QPixmap(":/icons/data/icons/equals_generator.png"))
@@ -410,7 +398,6 @@ class Ui_DialogModulation(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.comboBoxModulationType.sizePolicy().hasHeightForWidth())
         self.comboBoxModulationType.setSizePolicy(sizePolicy)
-        self.comboBoxModulationType.setMinimumSize(QtCore.QSize(0, 0))
         self.comboBoxModulationType.setMaximumSize(QtCore.QSize(16777215, 16777215))
         self.comboBoxModulationType.setObjectName("comboBoxModulationType")
         self.comboBoxModulationType.addItem("")
diff --git a/src/urh/ui/ui_plugins.py b/src/urh/ui/ui_plugins.py
index 29f6f617..19319b0e 100644
--- a/src/urh/ui/ui_plugins.py
+++ b/src/urh/ui/ui_plugins.py
@@ -40,7 +40,7 @@ class Ui_FramePlugins(object):
         sizePolicy.setHeightForWidth(self.txtEditPluginDescription.sizePolicy().hasHeightForWidth())
         self.txtEditPluginDescription.setSizePolicy(sizePolicy)
         self.txtEditPluginDescription.setReadOnly(True)
-        self.txtEditPluginDescription.setProperty("placeholderText", "")
+        self.txtEditPluginDescription.setPlaceholderText("")
         self.txtEditPluginDescription.setObjectName("txtEditPluginDescription")
         self.verticalLayout.addWidget(self.txtEditPluginDescription)
         self.horizontalLayout.addLayout(self.verticalLayout)
@@ -51,7 +51,6 @@ class Ui_FramePlugins(object):
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.groupBoxSettings.sizePolicy().hasHeightForWidth())
         self.groupBoxSettings.setSizePolicy(sizePolicy)
-        self.groupBoxSettings.setMinimumSize(QtCore.QSize(0, 250))
         self.groupBoxSettings.setMaximumSize(QtCore.QSize(16777215, 250))
         self.groupBoxSettings.setObjectName("groupBoxSettings")
         self.verticalLayout_3.addWidget(self.groupBoxSettings)
diff --git a/ui/modulation.ui b/ui/modulation.ui
index 5d2d34fa..1ba5c0ea 100644
--- a/ui/modulation.ui
+++ b/ui/modulation.ui
@@ -24,12 +24,6 @@
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
-       <property name="minimumSize">
-        <size>
-         <width>30</width>
-         <height>30</height>
-        </size>
-       </property>
        <property name="maximumSize">
         <size>
          <width>30</width>
@@ -226,12 +220,6 @@
            <verstretch>0</verstretch>
           </sizepolicy>
          </property>
-         <property name="minimumSize">
-          <size>
-           <width>227</width>
-           <height>0</height>
-          </size>
-         </property>
          <property name="placeholderText">
           <string>Enter Data Bits here</string>
          </property>
@@ -368,18 +356,6 @@
            <verstretch>0</verstretch>
           </sizepolicy>
          </property>
-         <property name="minimumSize">
-          <size>
-           <width>0</width>
-           <height>0</height>
-          </size>
-         </property>
-         <property name="maximumSize">
-          <size>
-           <width>16777215</width>
-           <height>16777215</height>
-          </size>
-         </property>
          <property name="showDropIndicator" stdset="0">
           <bool>true</bool>
          </property>
@@ -430,12 +406,6 @@
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="minimumSize">
-            <size>
-             <width>0</width>
-             <height>0</height>
-            </size>
-           </property>
            <property name="maximumSize">
             <size>
              <width>16777215</width>
@@ -487,12 +457,6 @@
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="minimumSize">
-            <size>
-             <width>7</width>
-             <height>0</height>
-            </size>
-           </property>
            <property name="maximumSize">
             <size>
              <width>7</width>
@@ -534,12 +498,6 @@
              <verstretch>0</verstretch>
             </sizepolicy>
            </property>
-           <property name="minimumSize">
-            <size>
-             <width>0</width>
-             <height>0</height>
-            </size>
-           </property>
            <property name="maximumSize">
             <size>
              <width>16777215</width>
@@ -578,12 +536,6 @@
            <verstretch>0</verstretch>
           </sizepolicy>
          </property>
-         <property name="minimumSize">
-          <size>
-           <width>100</width>
-           <height>0</height>
-          </size>
-         </property>
          <property name="toolTip">
           <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Shown Samples in View:&lt;/p&gt;&lt;p&gt;&lt;span style=&quot; font-weight:600; color:#ff0000;&quot;&gt;Red&lt;/span&gt; - if samples in view differ from original signal&lt;/p&gt;&lt;p&gt;&lt;span style=&quot; font-weight:600;&quot;&gt;Normal&lt;/span&gt; - if samples in view are equal to the original signal&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
          </property>
@@ -617,12 +569,6 @@
      </item>
      <item row="8" column="1">
       <widget class="ZoomAndDropableGraphicView" name="gVOriginalSignal">
-       <property name="minimumSize">
-        <size>
-         <width>0</width>
-         <height>100</height>
-        </size>
-       </property>
        <property name="verticalScrollBarPolicy">
         <enum>Qt::ScrollBarAlwaysOff</enum>
        </property>
@@ -670,12 +616,6 @@
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
-       <property name="maximumSize">
-        <size>
-         <width>16777215</width>
-         <height>100</height>
-        </size>
-       </property>
        <property name="acceptDrops">
         <bool>false</bool>
        </property>
@@ -695,12 +635,6 @@
      </item>
      <item row="1" column="1" rowspan="2">
       <widget class="ZoomableGraphicView" name="gVCarrier">
-       <property name="maximumSize">
-        <size>
-         <width>16777215</width>
-         <height>100</height>
-        </size>
-       </property>
        <property name="acceptDrops">
         <bool>false</bool>
        </property>
@@ -726,12 +660,6 @@
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
-       <property name="minimumSize">
-        <size>
-         <width>30</width>
-         <height>30</height>
-        </size>
-       </property>
        <property name="maximumSize">
         <size>
          <width>30</width>
@@ -846,12 +774,6 @@
            <verstretch>0</verstretch>
           </sizepolicy>
          </property>
-         <property name="minimumSize">
-          <size>
-           <width>0</width>
-           <height>0</height>
-          </size>
-         </property>
          <property name="maximumSize">
           <size>
            <width>16777215</width>
@@ -979,16 +901,16 @@
   </layout>
  </widget>
  <customwidgets>
-  <customwidget>
-   <class>KillerDoubleSpinBox</class>
-   <extends>QDoubleSpinBox</extends>
-   <header>urh.ui.KillerDoubleSpinBox.h</header>
-  </customwidget>
   <customwidget>
    <class>ZoomableGraphicView</class>
    <extends>QGraphicsView</extends>
    <header>urh.ui.views.ZoomableGraphicView.h</header>
   </customwidget>
+  <customwidget>
+   <class>KillerDoubleSpinBox</class>
+   <extends>QDoubleSpinBox</extends>
+   <header>urh.ui.KillerDoubleSpinBox.h</header>
+  </customwidget>
   <customwidget>
    <class>ZoomAndDropableGraphicView</class>
    <extends>QGraphicsView</extends>
diff --git a/ui/plugins.ui b/ui/plugins.ui
index 218a1f6b..be816af5 100644
--- a/ui/plugins.ui
+++ b/ui/plugins.ui
@@ -56,7 +56,7 @@
          <property name="readOnly">
           <bool>true</bool>
          </property>
-         <property name="placeholderText" stdset="0">
+         <property name="placeholderText">
           <string/>
          </property>
         </widget>
@@ -73,12 +73,6 @@
        <verstretch>0</verstretch>
       </sizepolicy>
      </property>
-     <property name="minimumSize">
-      <size>
-       <width>0</width>
-       <height>250</height>
-      </size>
-     </property>
      <property name="maximumSize">
       <size>
        <width>16777215</width>