Discussions - close discussed topic
Once the topic has been successfully discussed and results have been formed, it is important to close the topic. There are other users, who were to continue to post more messages on the final post, where the summery of the results were posted.
There should be an option to "Close" the discussed topic.
Currently there is only option to "make it private" however, make it private restricts others to see the posts. The others should be able to see the posts, but no more comments can be done once the topic is closed by the topic owner.
Hope you look into this asap.

Hi,
I can share what we do
1. Edit discussion name and prefix with [CLOSED]
2. Post a comment with bold big text. ‘Discussion is closed’ If you want you can post a link to a task which continues it etc so people can follow in the same last comment.
Typically this is enough.
Cheers,
Igor
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Dragos commented
Weird that this feature is still missing, seems so crucial in 2021. +3
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Deepak K Rana commented
Igor,
Thats a very indirect approach. A simple closed topic with a resolution would be great.
Refer to "Cases Management" system of Salesforce.
Regards
Deepak