Thank you for using our services.
If you have recently upgraded to Sitefinity 3.7 or Sitefinity 3.7SP1 you should also upgrade the external templates that you are using for the admin backend to the ones that are for your version of Sitefnity. Otherwise you will be missing this new functionality (if you are using external templates). If you are not there should be no problem with it.
the Telerik team