If self sign-up is allowed, you can also set or change the number of group members allowed in a group, but changing a member limit will apply to all groups in your group set. You can modify the limitations within an individual group, such as changing one group to allow a few more members than the other groups. However, at a later time if you decide to edit the entire group set and change the group set limitations, Canvas will override all member limitations created within individual groups.
Open Group Set
Click the Settings icon , and then click the View User Groups link . Or click an existing group set .
Edit Group Set
In the group set, click the Group Set Settings icon , then click the Edit link .