The keyboard uses function layers to address keys given the more compact layout.

The Esc key can be the top left key – yiu can switch the physical key to Esc (this key is included) or access it through pressing the Fn / Fubction key and the top left key on the keyboard.  Every key is fully programmable.

Like on the popular compact keyboard the HHKB, function keys are accessed by pressing Fn + 1 key on the top row for F1, Fn+2 for F2, etc.  You can order extra F1 side printed keys but the default set does not have F1 printed (still the same functionality either way).