My monitor is capable of 3840x2160 @ 60 Hz but I want to run the game at my monitor's optimal resolution of 2560x1440 @ 165 Hz. The game does not let you pick your preferred resolution when in "borderless" mode and always uses the maximum resolution regardless of the resolution selected in Windows Settings. This is making it so my monitor changes to 3840x2160 @ 60 Hz when the game is in focus and back to my default when out of focus.
The game needs to either use the display's chosen/optimal resolution or let the user choose like when playing the game in fullscreen.