Running a 4K (3840x2160) monitor at 200% OS scaling in Win10 x64. When I select any display size smaller than this in Ironwail and Borderless mode, it runs in a borderless window as expected. However if I select 3840x2160 and hit Apply Changes, it enters exclusive fullscreen mode. Strangely, if I select 3840x2160 and then hit Test Changes, it temporarily correctly switches to a borderless windowed 3840x2160 resolution, but upon accepting the changes snaps back into exclusive mode.
Running a 4K (3840x2160) monitor at 200% OS scaling in Win10 x64. When I select any display size smaller than this in Ironwail and Borderless mode, it runs in a borderless window as expected. However if I select 3840x2160 and hit Apply Changes, it enters exclusive fullscreen mode. Strangely, if I select 3840x2160 and then hit Test Changes, it temporarily correctly switches to a borderless windowed 3840x2160 resolution, but upon accepting the changes snaps back into exclusive mode.