Newbie question: How to add a sum of values to the top or bottom of a dashboard?

I’m sure there is likely an obvious answer but I can’t find it myself nor can I find it in searching in here (I may be using wrong terminology as I am pretty new to Epicor)

I have a Dashboard that uses a BAQ to show rows with customers ([Customer].[Name]) and their total sales (sum(InvcHead.InvoiceAmt)) in a month. This works fine.
I now want to add a single TOTAL of all of the sales items for all of the customers shown… how can I do this?
Using the “Show Summaries” option on the Sales field in the dashboard doesn’t seem to do anything.

Appreciate any thoughts as I work to get up to speed on BAQs and Dashboards!
Thanks,
Nick

I found what I needed - In addition to selecting Show Summares, I also had to then right-click again and choose to see the Sum.