Hi ,
Welcome to the Support Portal. How can we help?

How can I adjust permissions to a file?

When a file is selected, the option of sharing appears in the upper action bar. Here you can decide which users can view or edit the file within the organization.

Possibilities to set permissions for folders and files in the Workspace is depending on the permission structure set in Office 365. If you are not permitted there, you will not be permitted within the Workspace. In this case, contact your Administrator.