Steps:
1. Open preference setting window from menu.
2. Select "Qt Quick" from the navigator panel. then select "Qt quick designer" tab to setting the canvas size.
3. Change the canvas size from width: 10000; height: 10000 to : width: 5000; height: 5000. Click "OK" to close the window.
4. Reopen the preference setting window and check the canvas size.
Expect result:
The canvas size value shows width: 5000 height: 5000
Actually result:
The canvas size value still width: 10000; height: 10000