It would be great to have a screen where we can see the list of JSM licensed users and projects they are part of on the same screen.

Workaround

There is a way currently to see what projects a user has access to in the Jira Cloud version. Here are the steps:

1. As a site/org admin, go to settings.
2. choose user management.
3. To the right of the user name, click on 'Show Details.
4. This will open a user information screen showing various pieces of information. If they have Jira access, click on the three dots (...) at the end of the Jira object.
5. Then, choose 'View Jira Project Roles' from the options.
6. This will show the projects and the permission levels that users on each project