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Can't change the configurations of the Game
Whenever I do change something in the configurations of the game and I close it, once I open it again, the configurations have been reseted. I do press the "apply changes" whenever I'm doing it, but it seems that it isn't happening. Also, does anyone knows how to change the modern menu to the old one?
Delete the custom.cfg files from both your Toribash installation folder (if there's one there) and from Saved Games/Toribash folder and try again - chances are there you got multiple instances of it which breaks how customs are being set.

To switch to old menu, do /opt newmenu 0
Keep in mind though, legacy UI isn't getting any updates since 2018 so you'll be missing on pretty much all the new features + any bugs related to it are not going to be fixed.