Making a category as a submenu
Making a category as a submenu
Choose "Navigation" → "Menus"
Choose "Header" or "Footer" (where do you like to show your categories) and click Edit. Usually categories are shown in "Header".
Choose "New Link" (upper right corner) to add a new menu element as "Categories"
Enter your Link details
Choose what page you want make submenu to

Add Link (or Save if you want change already existing link).
You now will see Category as a submenu on your homepage.

In Admin view submenu will be shown on "Menus" → "Header" like this:

Your Categories page will look like this:

Updated on: 03/06/2020
Thank you!