is free will a physics question?

Einstein believed in the God of Spinoza. Major events are negotiated with God prior to our birth - so they are free and not free. At any point in time, the past is fixed and the future is possible. We never exist in the future, only God - and God simply acts perfectly in all times - with perfect Love. How that looks to us may be confusing until things work out. There is no evil - that is a human creation. What is fortunate and unfortunate is a different thing. Things just are. Our experiences of them are our own, as our past actions. Future actions are free to us - and are not determined - just the general plan - and we can always junk the plan. God has backups.

Our brain may select thoughts to use via chaos theory, but that is still the brain selecting - which as long as we are not dead - is us.

Everything may be known if one looks from beyond time. Looking beyond time, however, is not our point of view. We live in time and any God worthy of the name acts perfectly at every second of time - even if we don't agree what perfect is as time goes on. We self-observe - but are not observers of all of time and space.