The Collections list page displays an index of your store's collections. To access the settings for this page, navigate to your collections list page in the theme editor and then click Collection listings under the Sections tab.
Control the number of Collections per row (max 3) and Rows (max 10) by adjusting the respective sliders.
Using the Text style option, set the title text to Overlay or Under image. Additionally, you can choose to display or hide the collection descriptions by using the Show descriptions option. Collection descriptions will only show if Text style is set to Under images.
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.