Version 2.1.35 (84dcaa86)
Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Tools → Add-ons → (any Addon which uses Config) → Config
The window that opens does not take into account a (second) Win10 control bar installed on the right, such as “Linkbar”, but tries to use the entire width of the screen. Other programmes and the Anki main window run perfectly. So an Anki bug?