Hi there @DougAxen!
Don here from Shopify. :)
These extensions you are seeing there are a kind of 'wild card' to denote that any URL path starting with (for example) /collections will be included in this file no matter what the rest of the URL path is.
The +, %2b and %2B symbols all act in this fashion to ensure that the correct content is disallowed and the robots.txt file functions correctly.
While it's not possible to edit the robots.txt file to remove disallowed pages, you can 'noindex' further pages you don't want to have crawled by search engines by following the steps given here.
All the best!
|25 seconds ago|