On Windows, change the font size that JMP uses in reports and data tables by selecting Window > Font Sizes. Then choose from one of the submenu items:
Increase Font Sizes
Increases the font size. Select again to increase the font size again.
Decrease Font Sizes
Decreases the font size. Select again to decrease the font size again.
On Apple macOS, select View > Make Text Bigger or View > Make Text Smaller.