From what I could find, the way to set how screen resolution and target monitor behave needs to be either set with the in game option or by using command line parameters.
I personnally use -popupwindow -monitor 2 in the Steam launch options to use a full screen window and to start the game on my second monitor. I'm sure there are other useful command line parameters out there. I guess the solution would be do document the parameters and to remove the Screen selector checkbox from the launcher.
Unity Screen selector checkbox doesnt work
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Apparently, the Unity Screen Selector has been deprecated since v 2019.1 on the engine. (here's some reference in from Unity Forums).
From what I could find, the way to set how screen resolution and target monitor behave needs to be either set with the in game option or by using command line parameters.
I personnally use -popupwindow -monitor 2 in the Steam launch options to use a full screen window and to start the game on my second monitor. I'm sure there are other useful command line parameters out there. I guess the solution would be do document the parameters and to remove the Screen selector checkbox from the launcher.