Running Graylog v5.2.5, I have the problem that “regular” users can share their dashboards only with “everyone”, not with specific users of their choice.
This despite having enabled “share with everyone” AND “share with users” options in the configuration page.
I suggest that you include this as a “tip” in the configuration page where one selects “share with users”. It will save many customers (and your customer support) some time.