First, please create a new menu in Appearance > Menus that will contain the one page menu links for the homepage.
For the menu items URL link, you can simply target the section ID like
Once you created the menu, edit the homepage in Cornerstone then set the menu you have just created in as the One Page Navigation for the page.
Then go back to Appearance > Menus then set the
Menü Ref you currently have as the Primary Menu.
Hope this helps.