Hello,
I have found a bug with preferences which occurs when the android emulator is working.

Two ways to reproduce depending which preference settings were last opened.

If you previously were on Kits option (so if you open preferences and got Kits selected):

...........video_1.webm attached............
1. Open any project which will run on emulator (in my example x86 x64 cpp)
2. Run the application (deploy to emulator)
3. wait for emulator and app to load
4. Go to Edit->Preferences
5. Click tabs (Qt Versions/Compilers/Debuggers) and switch to any other option like Devices etc...
6. Observe that Preferences freezes and you are unable to switch to any other option from the left column

If you previously were on other option in preferences (Python in my example):
...........video_2.webm attached............
1. Open any project which will run on emulator (in my example x86 x64 cpp)
2. Run the application (deploy to emulator)
3. wait for emulator and app to load
4. Go to Edit->Preferences
5. Click random settings/tabs until it freezes (on this video it look longer than usual to take a freeze)
6. Observe that Preferences freezes and you are unable to switch to any other option from the left column