You can create a custom menu that contains just a single category in Appearance >> Menus and then add it to the header menu or the secondary menu.
For examples, you can see my book blog where I have a custom menu with four categories placed on the secondary menu, or my personal blog, where I have a custom menu on both the header menu and the secondary menu.
Ok, thanks. Now a different question but same issue: how do I change the font size in the submenus? For example, in your bookblog, I would like to make the submenu titles in the “About this blog”, such as “Purpose” and “Age recommendations” smaller. How would I do that?
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