Why don't all menu items appear in the navigation menu (level 1)?

In easyWeb standard there are two different navigation menus. Level 1, which is always displayed on the page and is created from the elements assigned to the "Pages" page. The second menu (level 2) contains the subpages of the elements under the "Pages" page and can be invoked by hovering the mouse. Level 1 contains as many entries as there is room for in the given page width. Level 2 always contains 3 entries per line and then fills up the entire page height line by line.

In the figures you can see the two navigation menus.