Situation 1: You want current Workspace Members to view but not edit your Tangos.
Solution: Set a folder's permissions to "Everyone in Workspace Can View"
By default, any Creator invited into a Workspace as a member will be able to view, edit, and share all Workflows in the Workspace. If you want other members in your Workspace to view but not edit your Tangos, you should change a folder's permissions to "Everyone in Workspace Can View".
Situation 2: You want to invite someone outside your Workspace to view an individual Tango
Solution: Invite them as a Guest in a single Workflow
You can invite users as a Viewer for specific workflows by sharing the workflow with members, or have a workflow in your Team Library and invite a non-member to the Workflow. The user will appear as a 'Guest' in the Members tab of your Settings modal.
Please note, Guests may only view or edit individual Tangos.