Main Menu Anchor

So I’ve already created the main menu and currently it’s going to landing pages. I’ve then installed the OnePress theme and the menu is working fine going to the landing pages.

However now I like how the OnePress theme is where the menu is using anchor to keep it on the same homepage instead of going to another landing page. How do I anchor the menu (landing pages) created previously to the homepage or would I need to just delete the menu (landing pages) and start over?