Only allow admins to add emoji
Note: This feature can only be controlled by organization administrators.
By default, any user in your Zulip organization can add custom emoji to the organization. You can change your organization's settings to only allow administrators to add new emoji.
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Go to the Organization permissions tab of the Manage organization page.
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Select the Prevent users from adding custom emoji checkbox under the Streams & custom emoji section.
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Click on the Save changes button to save any changes you made to your organization settings.