To modify the permissions of the members of a workspace you can follow the sequence below:

1. Expand the workspace list on the top right side of the screen and enter the workspace.
2. Click on “Invite” at the top left of the list.
3. Click on  “Advanced settings”.
4. Within the list of emails with assigned permissions, find the one you need to modify and select from the options: Read, Write or Admin.
5. Click on “Send invitation”