I had them both installed. I’ve now deactivated the Font Awesome plugin and we’re almost there. I have the menu setup like this:
All menu items have a light grey background with the test dark. For the current menu item, the background is red with white text; for hovering, the background is dark blue with white lettering.
Under the Menu Customizer, I can only set the Icons colour and Icons colour on hover. There is nothing to set the current colour like there is for the text.