We recently shipped Sprint 47 of Esper, and with that there's a change to how we display devices relative to Groups.
Previously if you viewed a Group, you'd get a grid view of those devices. From there you could click on the ellipsis to either add tags or rename a device.
With Sprint 47 we've simplified working with devices using filtering in the Devices & Groups view.
Now if you view a Group by clicking on the eye icon in the Group's name, you only get the commands and information available for that Group.
Instead you use Devices & Groups for this type of operation. Since the default view for Devices & Groups is the list view, you just need to switch to grid view and you'll be able to add/edit tags and device names.
Here are the steps for editing custom device names and tags:
1. Under Devices & Groups, open the drop down shown below and select Grid View
2. Either define a filter to display the Group you wish to work with, or search for the device that you would like to edit and click the "..." button to reveal the "Device rename" and "Add Tags" option.
Keep in mind that while you can add and edit tags for offline devices, you can only rename a device when it is online.