Ultrawide fullscreen broken

i use an ultrawide monitor and i have the problem that the game ignores my camera and resolution settings if i set it to 2560X1440 (16:9) in fullscreen ot simply ignores that and goes to 3440X1440 (21:9) and it does not matter wether or not i turn on resizable in render/armory project/window does anybody know how to set the resolution properly or if there is an windowed fullscreen feature