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I create a new menu for testing.
Them I login as a user to see the course and the new menu.
I was surprise to the the see the "New Learning Object" when I login
as a user. User are not allow to create learning object, only admin and teacher.
how to disable that functionality for the user?
see image:

I added the learning object to the student by mistake.
but I keep getting a "fix sequence error".
I do not understand the logic of the sequence.
thank

Ok, so you solved the issue yourself but want to understand what the "fix sequence" is.
When you add or delete items in a menu, you are actually adding or removing lines of db. "Fix sequence" just fixes the items order in the db to match what you are seeing in the UI. That's why you apparently do not see any change.
But it prevents potential issues, so it's a good idea to use it.