Go to Admin-> Site Setup
Open the “Header Settings” under the Design Settings
In the Link Displayed tab, Mention the number of links that need to be displayed in your marketplace website’s header.
Selected Number menus should be displayed in the header, remaining links should be available by clicking the “More“ option in the header menu
For example, you have added 8 static page links. But you have entered 5 in the link displayed. Then your header will display the first 5 static pages in the header and the remaining 3 under the more option.