How can tooltips be customized in Power BI?

Customizing tooltips in Power BI enhances the user experience by providing more context and relevant information when hovering over data points. Adding additional fields or measures is the key method for customization, allowing users to display specific data that gives insights into the underlying figures.

When extra fields or measures are included in a tooltip, they can show related metrics, comparisons, or detailed breakdowns, enriching the data storytelling within the report. This customization allows the tooltip to serve a dual purpose: receive immediate qualitative information while offering quantitative insights alongside already displayed visuals.

Changing the theme of the report may influence the overall look and feel of tooltips, but it does not directly affect their content. Similarly, removing additional fields would strip the tooltip of any enhanced information capability. Setting a default tooltip may apply a specific format or layout, but without the addition of relevant fields or measures, it doesn't truly customize the content displayed based on different contexts or data.