One other thing, f4 isnt full screening for some reason? dunno if its a bug or somethin
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Yeah I definitely want to get custom maps working on the web build, but it's really difficult, I tried using a godot extension to do it, but it works with really small files, it just froze with files as big as custom maps. Hopefully I can get it to work eventually.
If your keyboard has an "Fn" button, try pressing that and F4 at the same time. Otherwise, if you have a controller, you can use the select/share button to fullscreen too