Nothing has changed, it just doesn't save the setting because - lets be honest - users would cry all the time because they left it on.
You switch the setting on, unplug the joycons -> split, reconnect them -> the automatically unsplit.
The only difference that is that u set the settings after restarting the program.
Well I will consider saving the value.
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Well thats right, because loading a Game will cause the application to close and open with the ROM again.
Yea... thats a thing I didn't consider. I will make it save.