Editing a drop down menu

I am building a training using existing company created storyline templates. During the editing phase I can not see the option to edit a drop down menu, but when I enter preview mode there is a button for a drop down navigation menu on the top left corner of every slide. I would like to edit the options in the menu and what slides it appears on. How can I do that?

I have tried going to master slides to see if it is there, but I still cannot find the menu. I only see it in preview mode. You can see the issue with screenshots in the image attached.

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