The Tags column lists all of the groups an environment belongs to - click on a particular tag in order to refer to the appropriate group.
The required filtering will be applied automatically, whilst the selected group label will be displayed as a nesting element in the Env Groups navigation panel at the top.
Herewith, the appropriate group name will be temporarily hidden within the Tags column (as you are inside already).
Tip: In case the currently selected group contains further child items (i.e. subgroups), their list can viewed at the chosen group’s management menu within the top navigation panel.
Just click on the string with such child group to open it.
In order to cancel filtering and return back to the overall list of available environments, click on Env Groups.