Newbie question about the Top N filter

Hi all,

Very new to this but catching on quickly. What a great product.

So, if I ask a simple question:

I have a table visual in a report that lists 200+ rows of basic sales data: Company, Product, Revenue. I want to only show the top 10 rows that have the highest Revenue values. Problem is, the Top N filter is not available in the Revenue filter dialog. I see it in other fields though.

Why is that, and how would I accomplish this simple task?

thanks in advance!