Moto4 has made everything for your comfort, and adding subpages isn’t an exception. Organize a large number of pages into a drop-down menu and categorize them following the instructions below. It’s essential: don’t forget to add these subpages to the navigation menu. Otherwise, the visitors won’t see it, and your efforts will be meaningless. In case you add them to the pages menu, it also won’t work as they’ll be displayed only in the editor.