i have had the same issue when using fullscreen. i initially thought it was HDR related because it started after enabling that (HDR is a thing in this game, if windows has HDR on). turns out its not related at all. it due to the game just generally working poorly with Fullscreen and its constant need to resync the video output to the monitor or whatever its doing. what’s happening is your mouse is getting “stuck” on the desktop and not getting focused on the foreground fullscreen game. so whenever you press a mouse button, windows thinks you’re clicking your desktop or background window and minimizes the game.
if i leave windows open in the background i can see my mouse in game change as i move the mouse where those windows edges are in the background. an sure enough, if i click a button, the mouse click is registered on the background window and BL minimizes.
I think changing to borderless window and then back to full screen helps. or alt-tabbing. between this bug and the glitchy HDR implementation, its been a battle trying to get everything to play nice. ive had the minimizing issue both with an without HDR so i know its not related. i think the HDR being enabled just makes it more likely to occur; at least for me. when it all works, its great. ive tried messing with windows DPI settings too and it didnt help (i run 150% because 4k) because ive had issues where the game only takes up the top left of the screen too. how QA missed all this glitchiness is crazy. or they didnt care to fix before release.