This tutorial shows how to add a “view all” function to your collection pages in Shopify.
Open any product (Admin → Products).
Scroll down to the Tags section and add/select a tag for the product:
Save the changes.
When at least one tag is added, you will see the All button and the available tags on the collection page:
In case, you want to show all products on one page, navigate to Themes → Customize theme:
Select Layout & content settings → Collection products count and set it to 100 or the number of products you have.
Save the changes and refresh the page:
Feel free to check the detailed video tutorial below: