By no means an Expert ( X is an unknown quantity, and a Spurt is a Drip under pressure ) but "maybe" ?? going to the bottom of the folders list there is - or at least I have - an option in blue to "manage folders". That gives you the option to "hide" or "show" folders on their list.
Just a thought, you might find a clue. ( I know, you're going to tell me that you've tried that, in which case, sorry, I have no more clues )
Personally - I'm going back to a length of string and 2 coconut halves, or maybe a bonfire and a wet blanket.
"Life" was easier before computers, maybe ignorance was bliss, but it sure was a lot less stressful !