You can hide any lesson in your course, without removing user permissions.
When you deactivate a lesson:
This kind of change made to the course being actively visited by the learners can cause some issues. Please consider making these changes to a copy of the course while the course is in design and development phase.
Steps to deactivate the course lesson:
To re-activate the lesson click visibility Activate.
You can deactivate and activate a lesson as often as you want.