Hello, Spacedesk works fine., but there is a question the screen of the tablet is constantly lit, is there a setting so that it goes out when you don’t use it?
What is your secondary machine? is it Android/iOS?
Currently, there are no settings available that automate the spacedesk client’s screen to turn off when not in use.
However, you can just turn it off manually or disconnect it to conserve battery power.