Conversation filters
If you are in the group details, to which you have access by clicking on the group name in the left hand menu panel.
You may now hover your mouse over filters in the upper left of the screen (active filter is selected by default) and select whichever filter you want. The list of conversations will update according to the selected filter.
info_outline Note that if there are no conversation matching the filter, then the filter is disabled and cannot be clicked.