Is there a way to mark the subject line read only when replying to a message so the person replying cannot change the subject from what it originally was on the topic?
I don't believe there is a setting for it but you could probably hide the box in the editor. On my community we don't actually display subject lines for replies so it doesn't really matter if people make changes to it.
Both options would require editing the community design in studio. I have limited dev skills so I couldn't tell you exactly how it might be accomplished.
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