Don't show menu of modular page in main menu

Sorry for this probably stupid question, but I’m trying on it for 3 hours.
My main menu is
The is a modular page with
_top (Hero)
_serie-1 (Feature)

When I click on, the main menu disappear and I’ve on top of my menu-bar

How to keep the main menu (page 1, 2,3, 4) ?


Add onpage_menu: false to the header of the page.

Thank you for the help @pamtbaau !