Can someone explain to this doll how and why certain games default to (or worse yet, only) enter full-screen on the left-most monitor, rather than the one marked as 1 or Primary? Genuinely not sure what is going on in the case of these games.

Hi! We're a fairly diverse plural system with various origins and interests! ADHD, autism, likely BPD. Uhm... Yeah, gonna work on this a bit more soon?
Can someone explain to this doll how and why certain games default to (or worse yet, only) enter full-screen on the left-most monitor, rather than the one marked as 1 or Primary? Genuinely not sure what is going on in the case of these games.