The Collection list page displays an index of your store's collections.
Access the collections list page through the theme editor
To access the settings for this page, select Collections list from the page selector dropdown of your theme editor, or navigate to your /collections page in the theme editor, then click Collection list page under the Sections tab.
Select a layout option
Grid comes with two Layout options for your collection list page: Default or Masonry. Default will display your collection images and titles in standard rows and columns, whereas Masonry will create an offset collage-style layout, similar to the Masonry section on your home page.
Display collection descriptions
Checking Show description will include the descriptions of your collections on your collection list page. These descriptions can be edited for each collection in the Products > Collections section of your Shopify admin.
Collections per row and columns
You can also specify the Collections per row (2 to 4) and the number of Rows (2 to 6) that display on your collection pages using the dropdown menus.
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.