The Collections list page displays an index of your store's collections.
Access the collections list settings in the theme editor
To access the settings for this page, navigate to the Collections list page in the theme editor preview and then click Collection listings under the Sections tab.
Choose one of the two options for the Collection image layout. Two columns includes two equal-sized collection images per row, while Full width expands the collection so each row is occupied by that product only.
Show product descriptions
Here, you can toggle the option Show descriptions on or off at the top of the editor screen.
Select and rearrange the collections
There is a workaround for controlling which collections appear on this page, as well as what order they are presented. This approach takes place outside the theme editor, in the Navigation admin.
Create a specialized menu for the desired collections and order
In here, create a new menu called 'All collections'. When setting this up, make sure the handle for the menu is all-collections.
Once this menu is created, you can add in menu items for each of the collections you wish to have displayed on your Collections list page in the order you wish for them to be displayed.