When Windows 10 is used in portrait mode, the tablet connected screen cannot rotate in portrait mode.
So, I need a fixed portrait mode. For example, 90 rotations
Can you tell us your tablet’s operating system? Android/iOS/Windows?
In case it’s Android or iOS, please make sure that the Auto rotation is enabled in the Viewer settings and in device settings.
If your tablet is Windows, Auto-rotation is not yet supported so you have to manually rotate the screen via display settings on your primary machine side.