How To Allow Only Thread Author To Resolve During Merge Request

Hi,
I was wondering how I can make it so that only the person who opened up a thread can resolve it.
From what I see if a developer opens up a Merge Request, they are then also able to resolve any threads opened up by the reviewer, which can be a bit problematic since what each person considers the correct answer for the question the thread poses could be different, and this can make it much less comfortable for the reviewer during subsequent reviews when they want to see if the developer has fixed or changed what they suggested.
I assume it’s a matter of playing around with something in the settings, but I can’t seem to find exactly what.
Any help would be greatly appreciated.