would it be possible to connect my laptop to my main screen and have it only expand when needed, while keeping everything connected to my main pc? with projector settings maybe?
I don't want my main screen on my laptop. I basically only occasionally want to use my main screen as a second screen for my laptop
(I know that my kbm might be useless when using my laptop screen on main screen but that's fine)
I have a monitor with kvm switch but don't know/think it works like I want it to (it takes both, so main screen on laptop as well which I don't want)

would the only/simplest option be to just plug/unplug a cable when I need the expanded screen or not?