For this blog post I wanted to extend our post on multiple-select parameters and apply the same use case to legends on a dashboard. Right now legends are pretty static in Tableau. Unless you edit the base xml of the file you are always going to end up with a square with a description of the value to the right. While the legend is serving it’s purpose, I believe that it can be significantly improved on using parameter actions. I think the legend should be more interactive. We should have the ability to turn a set of marks on or off with a click of a button. Note: Currently selecting a value highlights that value–this is a nice feature, but it’s still a little clunky with the black outline around the selected values, in my opinion.In this tutorial we will build the following parameter-driven legend that will allow to select or deselect any value in the “legend”.