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Edit custom site menu - Can't find where it lives under hamburger icon

I am a UIUX designer, but I’m new to Webflow and can’t find where I go to edit the dropdown/full screen menu inside the hamburger icon. I saw someone else with the same issue and a great response that fixed their problem, but I don’t seem to have the same settings mentioned in the response. I just wanted to edit the photo/grid/fonts like I can on the homepage.

Here is a link to the site so far:

Any help would be super appreciated!