I’m Korean, so I can’t speak English well.
But I’ll do my best to explain the problem I’m having.
I am using that program with a surface pro 8.
I am using the Microsoft Wireless Display Adapter to duplicate the screen on the beam projector.
In that state, using the Spacedesk program for other surface products, the screen is additionally duplicated and used.
However, if I use the spacedesk program, the screen of the beam projector is changed from duplicate to extended.
No matter how much I change to duplicate using the win+P shortcut, it is fixed in the expanded state.
When the spacedesk program is disconnected, the screen of the beam projector starts duplicating the original screen normally.
There seems to be a bug in the program because such a usage environment is not common, but I do not know the exact cause.