Soon we will be incorporating a Shopify preset options to make it easier to define advanced trigger conditions if you have the Shopify integration. For now, you will need to utilize regular expressions for pattern matching if you want to define the trigger condition as a group of URLs without listing each one individually.
By default with Compose you can easily define AND/OR trigger conditions for Page URLs, JS conditions, or Query Strings. But if you want to define a trigger that is any visitor on the site (i.e. triggering on all pages), anyone who visits any product page, or any other group of pages you will want to use regular expressions.
You can see an example of a demo Shopify Store below. The top example matches all traffic to the site and the bottom one matches all product pages.