Got resize working just fine

calibrationwindow.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="sizePolicy">
-   <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+   <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
     <horstretch>0</horstretch>
     <verstretch>0</verstretch>
    </sizepolicy>
@@ -24,22 +24,15 @@
   </property>
   <property name="maximumSize">
    <size>
-    <width>400</width>
-    <height>300</height>
+    <width>600</width>
+    <height>600</height>
    </size>
   </property>
   <property name="windowTitle">
    <string>Reference Adjustment</string>
   </property>
-  <widget class="QWidget" name="verticalLayoutWidget">
-   <property name="geometry">
-    <rect>
-     <x>9</x>
-     <y>9</y>
-     <width>381</width>
-     <height>281</height>
-    </rect>
-   </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
     <layout class="QVBoxLayout" name="verticalLayout">
      <item>
       <layout class="QHBoxLayout" name="horizontalLayout_3">
@@ -259,12 +252,26 @@
         <number>10</number>
        </property>
        <item>
-       <widget class="realKnob" name="knob" native="true"/>
-      </item>
-     </layout>
-    </item>
-   </layout>
+        <widget class="realKnob" name="knob" native="true">
+         <property name="sizePolicy">
+          <sizepolicy hsizetype="MinimumExpanding" vsizetype="MinimumExpanding">
+           <horstretch>0</horstretch>
+           <verstretch>0</verstretch>
+          </sizepolicy>
+         </property>
+         <property name="minimumSize">
+          <size>
+           <width>75</width>
+           <height>75</height>
+          </size>
+         </property>
         </widget>
+       </item>
+      </layout>
+     </item>
+    </layout>
+   </item>
+  </layout>
  </widget>
  <customwidgets>
   <customwidget>