How do I leave a group?

Android (e.g. Samsung, HTC, Sony): To leave a group, go to the group and open the menu (top left-hand corner). Click on the group's name and then "Leave group". All other members remain in the group.

iOS (iPhone): To leave a group, go to the group and open the menu (left top corner). Click on the group settings and then "Leave group". All other members remain in the group.