If your website has quite a large amount of sub pages or categories you might want to consider using a Mega menu.
To apply a Mega menu to the current website see - How do I change the look of my menu buttons?
Remember to make a backup of your theme in case you want to restore to the current style.
Standard menu vs Mega menu
The standard approach to menu dropdowns has each sub-category appearing under main menu when the top-level menu item is hovered over. With the Megamenu, all items from two levels deep are shown on hover with the menu stretching full width across the menu width.
Standard menu with single dropdown
Mega menu showing categories two levels deep
Alternate Mega Menu format with dropdowns
There are two Mega menu formats. The first shows categories two levels deep, while the second mega menu shows only one level deep, with the second level showing on hover. This is useful for sites that have many nested categories
Heading 3 - Use H text icon to change heading size
Mega Menu option 1 - two levels deep showing
Alternate Mega menu option - with one level showing and the second on hover