Group directory
If you wish to see the complete list of groups, simply click on the Group directory in the left hand menu panel.
Or you can use a shortcut by pressing G twice on you keyboard.
My groups
This is the complete list of groups you are part of.
info_outline Note that even if you are the creator of the group, you don't have to be a member (Someone else can still kick you out, or you can remove yourself from the group).
Other active groups
This list contains all active groups that you are not a member of.
info_outline Note that you won't see private groups here, as private groups can only be seen by their members.
Archived groups
Groups in this section are no longer accessible or changeable. However if you are a member of such group you can still access its conversations via the search for example.