am having same problem as @SomeRandomUser1234, no error appears for me, it just dosen't toggle. also in the control menu, what do the dev codes do?
Did you try using soft reset option?
The dev option is for development purpose, not for end users. It gives you access to controls which can disable internal scripts and some other useful options.
Let me know if the reset option fixes it.
You must have entered a wrong element identifier then. Make sure you are typing the right one for the element you wish to edit. Works fine for me.