Can you highlight a treemap?

Donna Coles takes you step-by-step, from setting up a pSubcat parameter and creating the Is Selected Sub Cat calculation, to configuring marks, colours, and formatting with finesse. Then she adds the magic: a dashboard parameter action for interactive selection, and a clever HL dummy field paired with a highlight action to avoid the usual fading effect on deselection. The result? A polished, responsive treemap that feels intuitive to users – and elegant in function.