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

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.