You build a report page with a line chart showing monthly revenue for eight product categories, each as its own series (line). Stakeholders complain the chart is too cluttered and they cannot follow a single category's trend when they hover over it. You want consumers to be able to temporarily emphasize one category's line while the others fade into the background, without removing any data or changing the chart's fields. Which built-in Power BI capability should you enable or use to meet this need?