Hello Jenny.

Although I did what you have suggested, no menu appear on the homepage, only on other pages and not posts. I manage to turn around the problem by making a navigation page accessed from the homepage (by clicking on the only link on it; “Explore”). You can have a look here: https://marcpauze.com

It would be good that the site menu icon appear on top of all the site (pages and blog post).

Cheers!