I have to do this every time I launch the game. I am on a 5120x1440 ultrawide monitor and I play the game at 3440x1440 windowed, by default the bottom of the screen is cut off slightly, but if I move the window the game seems to “adjust” and work properly until I close the game. I even tried to reduce the window border size in regedit, but after thinning the window border the problem still persists. I started playing the game in the previous public patch, and the issue persists between all versions that I played and I didn’t see this issue in the PUP notes released today.
If there were an option to tweak the windowed resolution a bit so that it’s slightly less height than my monitor’s height or if the threshold for edge scrolling at the bottom of the screen was extended I think that would solve the issue.