☑ Engage: to manage the memberships and document permissions existing in your communities.
☑ Filer: If you have files stored in an On-Premise file system, you will find your libraries here.
☑ Applications: contains a list of third-party applications (= not part of the Microsoft 365 suite) configured on your account, which can access your Microsoft 365 data.
All those dashboards have the same possibilities as the other tabs. Please refer to OneDrive or Teams tab to understand better what you can do.