r.SetRes 2560x1440w - works ok
r.SetRes 2560x1440wf - is fullscreen windowed but does not change/scale the resolution (it uses always screen full resolution 3840x2160 in any command resolution case)
r.SetRes 2560x1440f - broken fullscreen changes the resolution, but occupies just top left corner of the screen without the resolution scaling (as in the image in my first message)
when compiled this happens with the default project files as well