This is part of #3797

On a new site, I was plagued with 100's of new dodgy user accounts (because of #574). Because our VBO does not allow me to select all users from the many pages, my options were to either do a direct db query, use phpmyadmin, or manually repeat the process of selecting/deleting/confirming for each of the 12's of pages. This is not good UX, and the 7.x version of VBO included an option to select all items across all pages:

Screen Shot 2019-05-20 at 9 12 38 am

Here's what that option allows:

Screen Shot 2019-05-20 at 9 49 46 am

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/3798
GitHub Issue #: 
3798