Add Map Icon missing in Visual Editor of Events & Bookings posts; shows in regular posts


My client's site is here: but unfortunately I haven't yet figured out how to get the events calendar page into the navbar, so you won't be able to see the events…anyway, I've gone through the Google Maps plugin instructions, and the Add Maps icon shows up in the Visual Editor on normal posts, but not in the Events and Bookings plugins: which defeats the purpose, of course.

Please see the screenshot of a regular post and an Events plugin post, attached.

What do I need to do to fix this?