Your description doesn't make sense to me so this answer is probably not what you are looking for (if so I will convert to a comment; you have to let me know). If you go to Settings -> Access controls -> Roles -> `, you will see a setting calledDefault app. Whatever you set this to be will become the new landing page for everyone who logs in that has that role. If you then go to that app and configuredefault.xml` to point to the dashboard that you like, then everyone who lands in that app will have the same view that you just set.
