By "Products on the Menu" ... do you mean "Categories on the Menu? ..... Or "Products on the page"?
You can't put products on the menu. Only Categories. But from the pic ... looks like "Products on the page"
1. First ... check this page and follow the instructions ...
https://alidropship.com/codex/page-error-404/ ... Even if it's set correctly ... STILL click the save button.
2. If that doesn't fix it it ... check that you have actually assigned products to categories. Go to "Products" ... choose a product and click "edit" ... and see if it's assigened to any category.
Actually, I'm betting the second one is the problem.
3. EDIT: Oh! ... and make sure you have clicked the "Publish" button with all your products.