Adding subpages to the site will allow you to organize a large number of pages into a drop-down menu and also categorize them. For that, follow the instructions below.
1. Click on the menu settings:
2. Hover over the page which you want to make a sub-page and “grab” it with the help of the arrows to the left:
3. Move the page up or down the list and drop it under the relevant page. Place it a bit to the right until it becomes a subpage:
Keep in mind that you can add multiple subpages to a single page:
This is how it will look on the published site: