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I don't have a Linux box at hand to test with, but I'm just using the default PICO-8 binary export. I'll check it out tomorrow and see if I can help. In the meantime, Alt+Enter toggles fullscreen on all the other platforms, so maybe it'll help here as well?

Oh yeah you are right, it does. So few games that I have played in the last years actually support that function that I completely forgot about it. Cheers!