About the designer of qtcreator the solution to the problem that qtdesigner can't pull and hold controls normally

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problem

   All of a sudden Qt Interface designer cannot be used .
  

Try

   reinstall Qt, Unresolved
   Empty recent items , Unresolved
   Create a new project and interface , Unresolved
   Open the existing project and interface , New interface , Unresolved
   Delete user profile , solve .
  

resolvent

   Delete user profile
  
   Then you can drag and drop the control , You can select the layout after dragging the control ：
  
   You can use the （ Under normal circumstances , There are no controls in the interface and you cannot click to set the layout ).

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This article blog address ：https://hpzwl.blog.csdn.net/article/details/125224696