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From that page you can control a few options which are globally applied.
Group Browsing
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Using that toggle button you can choose to enable/disable Group Browsing globally (i.e. no user will be able to browse any of his/her groups).
By default, this option is enabled.
Extended Browsing
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Using that toggle button you can choose to enable/disable listing of groups users are member of but not allowed to browse (either because it's globally disabled or through a specific policy).
By default, this option is disabled (to simplify users interface).
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Using that toggle button you can choose to enable/disable logging for Ambassadors actions (Ambassador adding or removing a group member).
By default, this option is disabled (as it's available in Jira's audit log).
Self promotion
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Using that toggle button, you can enable/disable self promotion for Ambassadors. Self promotion is when an Ambassador, not member of a group, uses its Ambassador privileges to grant themselves group membership.
In other words, disabling this option will prevent Ambassadors from adding themselves in groups they are allowed to manage.
By default, this option is enabled.
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Using that toggle button you can choose to enable/disable Super Ambassadors feature which allows Ambassadors of a group to nominate Ambassadors for that group by themselves.
Please note that Ambassadors (non administrators) can't revoke an Ambassador privilege, they'll have to request it to admins, except if Extended Super Ambassador (below) is enabled!
By default, this option is disabled.
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Using that toggle button you can choose to enable/disable Extended Super Ambassadors feature which allows Ambassadors of a group to revoke Ambassador privileges to any Ambassador of that group by themselves.
This option is not dependant on the Super Ambassadors option and can be enabled/disabled separately.
By default, this option is disabled.
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Using that toggle button you can choose to enable/disable Users Groups feature which allows Ambassadors to see other users' groups membership from within the group browser view.
This setting will also enable the Group Membership Explorer.
By default, this option is disabled.
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Using that toggle button you can choose to enable/disable Performance Mode feature which allows to stop displaying group usage in “My Groups”.
This setting is useful when a project contains many users and many groups.
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Api token
An admin needs to generate and provide an Atlassian api token that will be stored in atlassian’s storage, in order to make the necessary api calls to grant ambassadors the privilege of adding and/or removing users from groups they are ambassadors of .
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We are working on other options in the next releases to give admins more control over the application.