It appears since upgrading to 14000 - 14004, we are missing the ability to re-add or use the column "Site" to reappear in the Users list and search by this column. The column was there before the upgrade and is now gone completely. You also cannot go into add the column back as it is no longer listed as a column choice. Since that column is no longer available, we can not search by Site to see which Users are associated with what site. This is very problematic since we have over 300+ sites, with 1000s of different users associated with specific sites. We also see this option gone under the Technicians list, but it doesn't have as much impact to us.  I have double checked and this seems to be happening on our test server as well as our production so its not a bug with one of our specific servers.