The documentation is not very clear. Using Mega Menus, I’m trying to get the sub-menu items [pages] to display their Featured Pic in the mneu, but I can not get that to happen. Specifically, does it have to do with this?
Next, Click the Screen Options link in Right side top area. There Tick the checkbox on the ‘Show Advanced menu properties’
Now, In the menu box, You can see the CSS Classes (Optional) text field. In that text field, type the trailer to get the Long Trailer Style MegaMenu.
Click toSave Menu and Get Trailer Style mega-menu