Standard Power BI reports display simple black data boxes when you hover over a chart element. While these default tooltips show precise data coordinates, they offer very little business context. Fortunately, Power BI allows you to design custom tooltip pages. This advanced feature lets you embed entire hidden mini-dashboards that appear dynamically as users hover over data points.
Step 1: Create a Dedicated Tooltip Canvas
First, add a fresh blank page to your Power BI Desktop file. Because this page will act as a pop-up window, you must adjust its default canvas dimensions. Navigate to the Format page menu on the right-hand side panel and expand the Canvas settings dropdown.
Next, change the page type from a standard 16:9 ratio to the official Tooltip preset size. This action instantly shrinks your canvas into a small rectangle. Additionally, you must expand the Page information section and turn on the Allow use as tooltip toggle button. This crucial setting tells Power BI that this small page is ready to act as a hover visual.
Step 2: Populate and Link Your Hidden Visuals
Now you can design your custom pop-up layout. Drag two or three small visual elements onto the shrunk canvas area. For example, if your main chart shows overall country sales, you can place a tiny horizontal bar chart inside the tooltip page to show specific product sales.
Once your mini-layout looks polished, navigate back to your main dashboard page. Select the specific chart visual that needs the upgraded hover feature. Go to its visual formatting properties, expand the Tooltips options, and change the type setting from “Default” to “Report page”. Finally, select the name of your newly created tooltip tab from the page dropdown list.
Step 3: Test the Dynamic Hover Experience
Hover your mouse cursor over a data point on your main chart to review your configuration. Instantly, Power BI filters your hidden mini-charts behind the scenes to match the exact data point under your cursor. This advanced technique allows you to provide deep, layered data analysis without cluttering your main dashboard workspace.
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