BrokenTorpedo
I saw in itch.io that a user complained of having trouble entering in fullscreen mode.
You need to press alt+enter to enter/exit fullscreen mode.
Or you just edit the file "mkxp.conf" with a text editor, and change the line "fullscreen=false" to "fullscreen=true", if you want to start your game directly in fullscreen mode.
more info fullscreen=false
at the second line of the conf file is written
###detailed information here
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... you may want to take a look ...in case you want to experiment with other settings