Bookmarks Page Adjustments

I am building a directory website using the theme Listable. I am using WP Jobs Manager plugin. I am looking to make adjustments to bookmarks page. currently, when I go to the bookmarks page, it gives me access to all vendors. I want to have it to where only vendors that were selected through bookmark will display. I also want to make it so that if no bookmark is selected that the page will be blank. I looked through the theme documentation (https://wpjobmanager.com/document/bookmarks/) but was unable to find the way to make the adjustment to bookmarks. Am I able to make the adjustments to my site?

For complete disclosure, I am using the bookmark only for users, not vendors. The Vendors, who add and claim listings don’t need the bookmarks feature.

The page I need help with: [log in to see the link]