Generate tooltips from table fields
The Tooltip from field option in table visualizations allows you to use the values from another field (or column) in a tooltip.
When you toggle the switch on, you can select from a drop-down list any of the fields in the table to be used as the source of the tooltip content. All table fields are available for selection, whether visible or hidden.
While you can turn on this option for all the cells in a table under Cell options, it’s most helpful when used as an override on a subset of cells instead.
For example, the following table has five visible fields (columns) as well as a hidden field called “Info”. The values from the “Info” field are used as tooltip text for the “Short text” cells using the Cell options > Tooltip from field override property:

The content of the tooltip is determined by the values of the source field, and you can use field overrides on the source field to manipulate the display of that value.
For more detailed information, refer to the documentation.