How to mention in Discourse comments, or disable commenting?

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Are they enabled?

The image shows a settings interface allowing administrators to enable or disable the ability for users to mention or tag each other in their posts using the '@' symbol. (Captioned by AI)
The image shows a settings interface allowing administrators to enable or disable the ability for users to mention or tag each other in their posts using the '@' symbol. (Captioned by AI)1080×600 54.9 KB