Do you have this entry in the sys.txt: "extra_settings = 1" ?
If so, you have a symbol in the main menu like a laboratory bottle.
Spoiler: Screenshoot
If you tip on it, you will come into a menu with the name "Ui Labs".
In it the entry is: skip navigation menu. With this you switch off the navigation menu.
The way back is easy, a long pressure on the "Menue" button brings you back to the main menu.
Open here again via the "Laboratory bottle" Ui Labs "and recall the" Skip Navigation Menu "entry.
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