Groups have a soft cap of 100 members.
For a group to have more than this, you have 2 options:
- New members must use a referral link to have the ability to join a group. The referral link can be provided by any current member of the group. With referral links, a group can increase up to a hard cap of 120 members.
- Supporters who are group moderators can set the limit of the group to no limit
Here is where you can find the referral link:
Here is where you can change the group setting under the group edit page: