If you do not see the Individual Card Settings controls, turn off Print Mode.
The buttons to adjust the font used in the upgrades boxes are in the Individual Card Settings box:
These buttons allow you to increase or decrease the font size used in both the upgrade boxes and the pilot/ship abilities, including if the pilot/ship abilities are included with the pilot name. Adjusting this control may help you produce a more visually appealing card or to correct the overflow that may occur when a ship has a lot of upgrades. For example, there are some dual Firespray builds that use a lot of upgrades and do not look good and in fact are unusable with the default font size:
By clicking the "-" box to decrease font size, you can create a more appealing and functional card: