I think that is moderator….
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Typically, only the person who asked the question, and a user who has admin rights in a space can mark content as correct. You could create a user group of your experts and give them admin control in the space, allowing them to mark any answer as correct, but preventing other users (aside from the person who asked the question) from doing so.
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If you are on cloud, you'll need to change your outcome settings to select "Limit the marking feature to those users who are granted the "Mark Outcomes" homepage permission," and then assign a group or person to mark outcomes.
Here's some directions:
Core Help -Limiting Structured Outcomes to Specific Users