Creating a rectangle tab with an arrow

Hi,

 

I'm playing with this free accordion template, but I've run into an issue I can't figure out. The arrow that is attached to the tab (rectangle shape) is not selectable (I've looked in the master, etc). It seems to have a special positioning which I don't understand. The link to the template is here: https://blogs.articulate.com/word-of-mouth/free-accordion-template-for-articulate-storyline/

Help would be appreciated!

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