How to remove a course ?

Hello,

Since I'm using my Fenix 5X Plus, I've sync many courses on my watch.
For most of them, I only need the course 1 time.
With a lot of courses on the "Navigate" menu, it's harder/longer to select the one I want to use.
Even some courses that I've removed from my Garmin Connect are still on the watch.
I'd like to remove all the courses that I've previously use and will not use again.

How to remove a course from the watch ?

Thanks a lot,