I can't show a specific menu module in the menu bar

Hello, good morning.

I'm using the Buster template with YJSG Template Framework. My problem is that I have two menus, a main menu and a secondary menu.
The default menu is the main menu, but I want a particular page to show the secondary menu and I can't do it.
I have deactivated the main menu for the specific page and created a menu module for this page with the secondary menu. The problem is that it doesn't show it. The position where I insert the module is topmenu.
Is it possible to put a secondary menu instead of the main menu?

Thank you very much.

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