You can resize Data Table chart text. Resizing table text changes the pixel size of the following components:
Header text, including icons
Body text and the vertical height of rows
To resize data table text:
Navigate to the Customize tab in the Chart Builder.
Click the General drop-down and toggle Text size to On.
Set the Text Size to the desired number of pixels. You can adjust text size to be between 8 and 24 pixels. The default is 14 pixels.
For a complete list of Chart Customization options, see Customize Charts.