Sub-menu navigation has inconsistent flow
There's a couple issues with sub-menu navigation:
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Submenus either say "Exit" or "Return to main menu" and both actions do the same thing, so the language should be made consistent there.
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There's a lot of places where it would make more sense to return to the previous menu instead of returning all the way to the main menu; for submenus of the "Options" menu, rather than go back to the main menu, it would be more useful to just return to the previous menu