Strange occurence with resolutions...

Hello Unreal Community,

I have started learning Unreal Engine for a couple weeks now and I do not understand a strange occurrence when playing with the resolution.

When I press the “Play” button, my game starts at the correct default window size which is 720p (DPI scale 1) but then when I click on to any other resolution either to make the window bigger or smaller and come back to 720p my window is smaller, well it’s height is smaller making it more something like 1280x705…

I don’t think it’s dramatic but it’s a royal pain and I don’t understand why it’s occurring.

Can anybody shed some light on that please ?