I'm happy to know that's not only me who struggle same issue....
Answer is "no' from technical standpoint.
As long as you have Dimension on columnr, Tableau automatically creates "Divider", no way to remove it.
As you know, removing "Scenario" eliminate Gap.
This is a quite simple fact and no 100% satisfying solution...
Using Bar is not good I think.
So, here is my proposal.
Change "Year" to Continuous
Then add "Reference Line" in X-axis
I know this does not satisfy you, but the best I know.
area-chart_9.0.twbx 9.7 KB