In proper visualization principles, it's recommended to use only a few marks on a chart to avoid clutter. Instead, you can group data according to any logical criteria. But what if you need to display the members of a group? Use the tooltip!
For example, you can show the top 5 sub-categories by sales and group the remaining sub-categories under "Others." By hovering over the "Others" mark, a tooltip will display a list of these sub-categories and their sales figures.
It can also include other relevant details, such as the date and time the data point was collected. This added context helps users quickly understand the data point's importance and relevance.
How to display a sheet for only one mark in a tooltip
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