Epson LX-300+ Reference Manual page 66

Follow these steps to use the control panel to select a built-in
font:
1. Make sure the printer is on but not printing. If it is, wait until
it stops.
2. Hold down the Pause button for three seconds to enter
Micro Adjust mode. The Pause light begins to flash and the
two Tear Off (Font) lights show the current font selection.
3. Press the Tear Off (Font) button repeatedly to cycle through
the fonts, and stop when the lights on the control panel
indicate the font you want. Your selection stays in effect
until you change it again.
Note:
Settings you make in your application programs usually override
settings you make from the printer's control panel. For best results, use
your application to select a font.
Bar code fonts cannot be selected from the control panel.
66
Using the Control Panel