Choiceless awareness is the awareness without "you"-the ego-self- involved(without your preferences, your life history, beliefs). You're fine with all of the options and you're in a total acceptence of whatever is the case. You're fine If "a" happens or "b" happens or "c" happens or none of them happens. And with that clear awareness you know what is the right thing to do. Without this clear awareness the choices would always be based on conditioning.
This kind of clear awareness is the continous experience in the high enlightenment stages, and it is temporary experiences for the good spiritual people. So it is better to not seek this kind of awareness because you can't immediately have this kind of awareness and live based on it but you can live in such a way(mindfully, spiritually) so you can temporarily have this kind of awareness time to time and eventually you can permanently have this awareness when you reach to the high enlightenment stages. And then even when you act based on your personal preferences, you would not act based on attachment or serious desires but kind of a "game". And you'll never attach to the form-ego reality again because you would have the permanent realization of the illusory nature of the self/ego which is not more real than a shadow.