You can select the hover mode of an element, which is what appears when the user place the mouse cursor above this element.
To do so, select the element of your choice and press simultaneously the Control key (or Command on a Mac).
Then, you can edit the element the way you want: the changes will appear on hover on the element.
If you want to edit the second level of hover on an element, for example for a menu and its submenu, you can also do it!
Keep the Control key (Command on a Mac) pressed when you already are on the hover of the element. A pop-in will appear, allowing you to choose between the "Standard view" or the "Hover view".
Select "Standard view" to stay on the first level of hover or "Hover view" if you want to select the second level of hover.