Acorn4

The advice I was given when learning to play the Pipe Organ foot pedal keyboard (and a Piano Accordion is very similar in many ways especially since it is also a wind instrument and reed instrument, and has possible switched registers) was that you look at it twice during a session.

First, when you sit down to position yourself properly, including being able to reach all the keys easily,

And the Second time, when you get up, so as that you don't trip and fall over...

The Piano Accordion benefits from similar advice when placing the hands on both sides.... :-)

The brain rapidly builds a 3 dimensional location map of where everything is, as long as you let it, and don't try to keep shortcutting the process by peeking all the time: the same as placing one's hands on the piano keyboard, or indeed any musical instrument.