The screen magnifier is closed by clicking on the Windows or Desktop?
If you want to use the magnifying glass as a working tool so that the mouse and keyboard have full function and you can work normally during magnification on the screen.
This must however be activated, via the OneLoupe to-tray symbol. This is very handy if you use for example the screen magnifier in the full screen mode, the screen magnifier works in the so-called working mode. (... see Image-1)