Let's have a look at how to display two pie charts on a single page, which isn't always evident! Take the Superstore in Tableau Public and create two pie charts for two variables: sales and profits, incorporating all data in each chart.
The key is to create a new computed variable called MIN(1) (yep, one.) and place it on the rows shelf. (I have no clue why this works, to be honest.)
This concept was given by btProvider's youtube video. https://www.youtube.com/watch?v=1rqkjkUsUj4
Here's a glimpse at the sheet with Min(1) up on the rows shelf twice, resulting in two pie charts that may be specified individually on the Marks card.