Should I use predefined resolution for game or the user can change the game’s resolution?
I found out 
. thanks anyway!
Please post an explanation, as it’s very annoying when looking for this kind of post to see someone solved it and not know how to solve it. By the way, you can change the resolution in the layer editor(scene tab), but I don’t know much else about the resolution.
You can change the resolution through actions too (Game’s window >> Change the size of the screen), this brings the possibility to modify the resolution in runtime, useful to make video options for example 