In 3.6, using the Boost theme, I used the Title attribute to change the colour of the custommenuitems to match our brand (as shown below) but in 3.9 the Title attributes no longer show up, so I do not know how to customize the look of these menu items. Can anyone suggest another approach?
Create a child theme of Boost that overrides the method 'render_custom_menu()' in the core render and the 'custom_menu_item' to add something unique but consistent per menu item that you can use in CSS.
Thanks, Gareth. I managed to get it done with these changes: