QT designer cannot modify the window size, and cannot change the size by dragging the window with the mouse

Problem description ：

performance 1： Here's the picture , stay QT Designer interface , stay geometry Properties , After a certain point, the width and height are the original values , Cannot modify window size .

       

performance 2： Drag the window with the mouse , I can't drag it , Still can't change the window size .

       

       
       

       

resolvent ：

1、 Right click ui file ——> choice “ use … open ”——> choice “ Normal text editor ”

2、 Take yours. ui File on the window size of this code , Amend to read as follows , Save it , Right click again ui file ——> choice “ use … open ”——> choice “ Interface editor ” Open your ui file , You can get back to normal .

 <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>1024</width>
    <height>1024</height>
   </rect>
  </property>
  <property name="sizePolicy">
   <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
    <horstretch>0</horstretch>
    <verstretch>0</verstretch>
   </sizepolicy>
  </property>
  <property name="minimumSize">
   <size>
    <width>0</width>
    <height>0</height>
   </size>
  </property>
  <property name="maximumSize">
   <size>
    <width>5000</width>
    <height>3000</height>
   </size>
  </property>

       

       

The normal code for resizing windows is as follows , Yes, there is 4 Part of the , The data of these four parts can be modified according to your own needs .

I can not change the size of the window corresponding to ui The content of the file is as follows , You can see that a part of the code is missing .