Setting up permissions in big projects with many users and companies can be difficult.
Having a way to select a user and checking which permissions that user has to which folders would be great to confirm we have set up the correct permissions levels. Something like the " view as" option many sites have. The project admin can "view as" a specific user and see which folder that user has access to.
At the moment I have created test users and assign them to specific companies, this way I logg in whith the test email address and see what company A, B, C, etc. has access to.