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You change the view size or room size in gms?


It's the view size you'll want to change. ( And remember to enable the view! I've caught myself out with that a few times *cough* )
You can then set the port on screen size to change the resulting window size and it'll scale for you.
Remember to click off the interpolate colours between pixels option in global game settings to keep those pixels nice and crisp!

Excellent info. Thanks.