The Category menu is situated in Appratance -> Menus: -> Categories: https://take.ms/Z4XQ8 , then check each item and check which HTML Block is defined there: https://take.ms/rm3k7 , then edit it and define “links” per your needs: https://take.ms/EyWML
I mean link for the main Category. Example : Accessory, so when people click on that Category, it will open all product in Accessory something like that. it also like shop when click on it and it show all product that was uploaded.
In this case, you need to create a menu item from “Product categories”: https://take.ms/zKF19S , so the selected link from that area will move you to the appropriate category, either you can create a “Custom link”: https://take.ms/znqQH and set the desired link manually.