Inventory
Inventory page
Make sure you have already had an inventory page in the page list. If you don't see it, create a new page for Inventory manually.
This inventory page should be assigned to the "Electric Car Inventory" style.
The Inventory page is a kind of archive pages which couldn't be edited with Elementor.
Inventory Assignment
Go to Advanced Products > Settings > General > Choose an Inventory page. Here you should choose the inventory page you have just created above.
Add the inventory page to the main menu
After choosing an inventory page, you should go to Appearance > Menus > Primary Menu > Add the inventory page to the primary menu.
Or you can replace the original custom link with: yourdomain/all-cars/