Quicksight actions does not allow to highlight a particular data point in other selected visuals when it is selected from a particular visual of interest. It only allows filter, navigation and URL actions as of 2023 Sep. However other tool such as Tableau, PowerBI has this feature and users like me use this a lot. Therefore as a user I like to have this feature in Quicksight as well.
Hello @Nilupa, welcome to the QuickSight community! It would be helpful to have a customizable action that could trigger conditional formatting on a separate visual. I’ll leave this marked as a feature request and archive it for now.