To get the desired outcome, create a calculated field similar to the following:
if max(month([Order Date]))=window_max(max(datepart('month',[Order Date]) )) then 'show' else 'hide' end
Then, place it on the filter shelf and select show. It may be necessary to right click on the calculation and select Compute Using-->appropriate computation (i.e. Table (Across))
Hope this helps!
Tracy, you're the best. Worked like a charm! Thank you so much.