Catalogs are created to group categories (just like categories group products), now you can publish catalogs only from block editor and it will actually display all the categories together. Soon we will provide Catalog Management page with all necessary functionality to separate categories in groups and create fancy grids.
The catalog itself has the same functionality as the albums. After publishing the products in the catalog, ShopConstruct will display the main image of the catalog. When you click on the catalog main image, all of the products related to that catalog will open.