Francesca's suggestion is good. If these teachers are not going to be changing their sections of the course, you might want to do this change in permissions to non editing teachers role instead of the teachers role. Then assign them the non editing teacher role. They would be able to do grading etc. but not change the course. This may be helpful to you if you need a different type of course later.
Teaching with Moodle
Different teachers teaching different sections of the same course
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