Can't add new accordion tab in Upfront

OK I feel like a total noob asking this but how do I add a new tab in the accordion element when using Upfront.

When you drag a new element onto the page there is only two tabs and the help text says to click on the + symbol to add another tab but there is no such symbol anywhere in the element. It's driving me bonkers.

Look fwd to hearing from you on this soon.