Require users to include topics in stream messages
Note: This feature can only be controlled by organization administrators.
By default, users are not required to specify the topics of messages to streams; if a user sends a message without a topic, the message's topic is displayed as (no topic). Any other user can then edit the topic of such a message to set a topic.
Some organizations prefer to require that every message to a stream includes a topic. Organization administrators can choose to enforce the use of topics in new messages to streams:
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Go to the Organization settings tab of the Manage organization page.
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Select the Require topics in messages to streams checkbox under the Message feed section.
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Click on the Save changes button to save any changes you made to your organization settings.
Once this setting is enabled, any users that attempt to send a stream message without a specified topic will see a warning in the compose box and will be prevented from sending their message until they specify a topic.