I tried all. And read forum reply’s concerning mirror and stretching.
I’m on as of now latest w10, spacedesk, iOS, and Nvidia drivers. I switched off incompatible software. I did choose both native and non *resolutions in the app. Connected my primary screen through hdmi and dp. No succes. Both resolutions match up 1920×1080. But the iPad screen gets strechted to full screen. When it was working, half a year ago, the iPad screen on that resolution (1920×1080) was not stretched but had these black bars. Then mirrored screen worked. Now I can only extend. Cleared the windows display settings.
Any help needed.