Allow removal of 'All Visits' Summary Number in Fallout Vizualisations

[#1]

I've been building some Funnel Vizualizations in Workspace, and clicked the "x" to get rid of the 'All Visits' summary at the top. However when I save the Workspace and then close and re-open, the summary number has returned. I want to get rid of it permanently because its not relevant to the funnel and I don't want it to be mis-interpreted by users.