Not sure if this is a Windows issue or an issue with the app.
When cloning the display of my pc that I use for my bike trainer I get a large boarder stone the image. Not the end of the world but it would be significantly easier to use the touch screen if it was a little larger.
Also can’t get the usb connection to work. Not too bothered about that though
It’s possible that the aspect ratio of your client screen does not match the current screen resolution used in a mirrored spacedesk display.
What is the current screen resolution on your primary machine in spacedesk mirror mode?
Can you tell us your primary machine’s and Android device’s native screen resolution?