How do I alternate letterbox scale to letterbox integer scale on the game?

Hi!

I've made a "jerry-rig" and it worked for web. But when I export to nwjs it doesnt work.

I've tried so many things and nothing worked.

So, all I want to do is setting two buttons:

a) one that when clicked it sets letterbox scale (fullscreen)

b) one that when clicked it sets letterbox integer scale (not necessarily fullscreen).

How to do it?

Btw, nwjs seems to work only on fullscreen.