In online classes as well as in-person classes, I sometimes find it pertinent to allow students to collaborate during an exam. Depending on courses and their modalities, the formula that I put in place for collaborative exams is not the same but, in either case, I find that the approach has a positive impact on the students’ learning.
https://eductive.ca/en/resource/real-life-story/collaborative-exams-online-or-in-person/