Sure fire way to Hide H ^, even if your in a weird glitched state.
However, if you think there is a chance you are not familiar with the UI. Let me go over a few easy mistakes to make.
After changing the hentai visibility setting, you must push the Save button. It does not save and refresh the page automatically.
Also, hentai toggle is in the quick settings menu, not in the full page settings menu. Was the option you were changing
or
Hentai Toggle: Hide Toggle
The former would change weather or not hentai is visible (your goal).
The latter changes weather or not you can change the hentai visibility setting. (you can even lock yourself into hentai only mode)
Here is a little more info and pictures in the site help manga
Bocchi-sensei! Teach me MangaDex! -- Hentai toggle