Free will is a fun one to consider. I theorise that perhaps it's more like this, If you were given two choices then you observably take one and don't observe the other. However this does not suggest that the other choice was never taken, it just suggests you never observed it being taken.
which in turn means both choices are taken, since both (or All choices if you consider more options) are taken, then you can suggest there is no Free Will just Causality. However as an observer, you get to choose which outcome you observe thereby having choice (Free will).
which in turn means both choices are taken, since both (or All choices if you consider more options) are taken, then you can suggest there is no Free Will just Causality. However as an observer, you get to choose which outcome you observe thereby having choice (Free will).