Hello,
1/ Once I log in to your site, the content of the Home page is visible https://gyazo.com/8f83f4bd694cf31f68624aab579a22a6 . It means there is some kind of cache, because of which the problem persists for unlogged users. Do you use server cache or CDN? Clear all cache, including cache of plugins on your site, and then check how the site works via an incognito window.
2/ Appearance > Menus > Screen Options > enable product categories, Read more about menus, and watch videos from here – https://xstore.helpscoutdocs.com/category/15-menu-set-up
Regards