diff -r bb60dda3093f -r caac957e9834 src/settingseditor/settingseditor.ui
--- a/src/settingseditor/settingseditor.ui	Sat Feb 01 15:49:28 2020 +0200
+++ b/src/settingseditor/settingseditor.ui	Sat Feb 01 17:10:11 2020 +0200
@@ -17,34 +17,113 @@
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
-      <number>2</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="tabGeneral">
       <attribute name="title">
        <string>General</string>
       </attribute>
-      <layout class="QFormLayout" name="formLayout">
-       <item row="0" column="0">
-        <widget class="QLabel" name="label">
-         <property name="text">
-          <string>Language:</string>
+      <layout class="QVBoxLayout" name="verticalLayout_3">
+       <item>
+        <widget class="QGroupBox" name="groupBox">
+         <property name="title">
+          <string>Interface</string>
          </property>
+         <layout class="QFormLayout" name="formLayout">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label">
+            <property name="text">
+             <string>Language:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <layout class="QHBoxLayout" name="horizontalLayout_2">
+            <item>
+             <widget class="QComboBox" name="language">
+              <item>
+               <property name="text">
+                <string>System language</string>
+               </property>
+              </item>
+              <item>
+               <property name="text">
+                <string>English</string>
+               </property>
+              </item>
+             </widget>
+            </item>
+            <item>
+             <spacer name="horizontalSpacer_2">
+              <property name="orientation">
+               <enum>Qt::Horizontal</enum>
+              </property>
+              <property name="sizeHint" stdset="0">
+               <size>
+                <width>40</width>
+                <height>20</height>
+               </size>
+              </property>
+             </spacer>
+            </item>
+           </layout>
+          </item>
+         </layout>
         </widget>
        </item>
-       <item row="0" column="1">
-        <widget class="QComboBox" name="language">
-         <item>
-          <property name="text">
-           <string>System language</string>
-          </property>
-         </item>
-         <item>
-          <property name="text">
-           <string>English</string>
-          </property>
-         </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Rendering</string>
+         </property>
+         <layout class="QFormLayout" name="formLayout_2">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label_2">
+            <property name="text">
+             <string>Main color:</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <layout class="QHBoxLayout" name="horizontalLayout">
+            <item>
+             <widget class="ColorButton" name="mainColorButton">
+              <property name="text">
+               <string/>
+              </property>
+             </widget>
+            </item>
+            <item>
+             <spacer name="horizontalSpacer">
+              <property name="orientation">
+               <enum>Qt::Horizontal</enum>
+              </property>
+              <property name="sizeHint" stdset="0">
+               <size>
+                <width>40</width>
+                <height>20</height>
+               </size>
+              </property>
+             </spacer>
+            </item>
+           </layout>
+          </item>
+         </layout>
         </widget>
        </item>
+       <item>
+        <spacer name="verticalSpacer">
+         <property name="orientation">
+          <enum>Qt::Vertical</enum>
+         </property>
+         <property name="sizeHint" stdset="0">
+          <size>
+           <width>20</width>
+           <height>40</height>
+          </size>
+         </property>
+        </spacer>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="tabLdrawLibraries">
@@ -76,6 +155,13 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>ColorButton</class>
+   <extends>QPushButton</extends>
+   <header>widgets/colorbutton.h</header>
+  </customwidget>
+ </customwidgets>
  <resources/>
  <connections>
   <connection>