Navigate to the backend of Shopify -> Online Store -> Pages -> Add Page -> linked it to page.collection-listing

MANUALLY put the Exact (case sensitive), Exact Collection Name and separate each collection with comma, put comma for every collection you want to display.

For Example: Casual, Going Out, Party + Celebration, Rompers + Jumpsuits, Mini, Midi + Maxi

Here's the link url of the page: https://demo.shoptimized.net/pages/dresses