Once you have enabled the Responsibilities Map and assigned Users to Categories, you will need to save it as a Draft.
Click on the Save button near the top of the screen.
In the popup window that appears, give your Draft a Name and Description.
Click on the Save button within the popup window to save the Draft. You can create as many draft versions as you need to show the impact of structural changes.
See the Responsibilities Map Version Control guide for guidance on version control.