Which element is not necessarily included in a dashboard's default settings?

The correct choice is that custom charts are not necessarily included in a dashboard's default settings. This is because dashboards typically come with standard templates or visualizations that may be common across different use cases, such as basic charts or graphs that represent data in a straightforward way. Custom charts, on the other hand, are specifically designed or modified by users to meet unique analytical requirements or to convey information in a particular style or format. Since custom charts require additional configuration and do not conform to a one-size-fits-all approach, they are not typically part of the default settings that would be available immediately upon establishing a dashboard.

In contrast, elements like data labels, visual titles, and tooltips are more likely to be standardized and included in dashboards by default. Data labels provide essential context to the visualized data points, visual titles help identify the purpose of the dashboard at a glance, and tooltips offer additional information when a user hovers over specific data points. These features enhance user engagement and understanding, which is why they are commonly found in default settings across various dashboard tools.