lock in place/back arrow

I use the lock in place feature a lot.

can you tell me how to disable the back button on the menu bar when I’m in lock in place mode?
Thank you

Lock in place is designed to stop the program from changing the editor, it isn’t intended to stop you from doing so. If you want to get rid of the back button you can remove the header bar with the View/Layout/Hide Header View sub-menu though.