When Windows 10 is in tablet mode, all is fine: When the keyboard is plugged in, the osk is not showing. When the keyboard is not plugged in, it shows. The only problem that the Option (located in Windows under Settings > Devices > Typing > Automatically show the touch keyboard in windowed apps when there's no keyboard attached to your device) seems to be ignored, thus the osk not showing up in desktop mode, even when no keyboard is plugged in. (When I say "osk is not showing up", I mean "not automaticly").