Organize your page and post items within your menu. I have included our good friend Marion Black's training link below as a refresher on how to do that:

https://my.wealthyaffiliate.com/training/drop-down...

You may have a number of sub-items under a custom link or page, as shown below.

Notice, in this example, how when you scroll over the Products custom link, a blue "WP Mega Menu" button appears. Clicking on that button will take you to a new page with some other options that need to be set.

Let's continue on to the next page to review which options should be changed.