28 Pin AVR Development Board

I have a question regarding the 28 Pin AVR Development Board

sku: DEV-00029.

I noticed in the Development Board page it says -

Selectable +3.3V / +5V power supply voltage regulator

When I look at the documentation, I don’t see a callout for a jumper to do the voltage selection in the .pdf file, but the schematic it shows a jumper but its not named.

Anyone know how thats done?