Groups allow users to share resources, documents, and comments. "This is a great tool to facilitate collaboration on projects or within classes" (University of Michigan Library, 2021).
References:
Mendeley. (2021, April 7). What are Mendeley groups? Mendeley. https://service.elsevier.com/app/answers/detail/a_id/14948/kw/sharing%20/supporthub/mendeley/
University of Michigan Library. (2021, February 23). Mendeley basics. LibGuides. guides.lib.umich.edu/c.php?g=283006&p=1885647#:~:text=Creating%20Groups,on%20projects%20or%20within%20classes.