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How to change active Tab in the Editor

I have a Tab element set up on a site, but when I go into the Editor (as a client), I can’t change the active tab in order to edit the tab pane content. All I can do is edit the tab title and the currently active tab pane content. I must be missing something simple…?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)