Qt for Python (PySide/Shiboken)

Hi guys, I wanted to ask if you know how I can solve this problem: Since yesterday evening I can no longer change the size of any window/widget via QtDesigner. I don't understand how it is possible. Before this problem I changed the QtDesigner font with a personal one via preferences window. Thinking that this was the problem then I tried to remove all the libraries related to Pyside6 via pip uninstall. I deleted the folder QtDesigner inside AppData/LocalRow/QtDesigner via %regedit% and restarted the PC. Then reinstalled Pyside6 again. But the problem remains the same. I don't know how I can fix it or where is the issue. I cant upload a video here so i hosted on streamble.