Hello! I have searched for threads with the same question, but I believe the answers do not solve my problem.
I included a screen shot of the problem I'm working on and you can find my explanation at the bottom.


As the picture shown above says, we wanted to hide the "Normal" button because we don't want the user to be able to edit the template. The function of this form is only to supply answers to the given fields. However, we don't want to hide the whole bottom bar tab because we generally use large templates and the "Expansion" button is very useful. Thus, the problem is how to remove only the Mode selection button.
Any solution will be greatly appreciated.

My sincere thanks,
Leah