Almost every element in Pingboard, Groups included, has a Permissions tab for admins to set visibility and accessibility. There are two permissions options available to admins when creating or editing a group:
To edit permissions for an existing group, click on the group you'd like to edit from the Groups section of the Directory, then click the blue Edit Group button in the top-right corner (or click the Edit link that appears when you hover over a group card).
Permission options are at the bottom of the Group editor. Be sure to click Save after you've made your changes.
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