Hi there,
This is intentional! Imagine you are sharing your screen over discord, you don't want your players to see the same screen as you do.
Monitor 1 as defined by your pc is what we call your DM screen it is basically your virtual DM screen where you have access to all the information you'd normally have at the tabletop. Monitor 2 as defined by the settings of you pc is what you show your players.
This way, you never accidentally show too much.
However currently we are in our Pre Alpha phase of the project so there's no setting that turns it off on startup! It is done automatically.
Hope this helps!
Best Regards,
Elnilson
RA team