Action in the physical world is a smaller set of options than action within the mind.
Thus, the locus of free will is the mind not the body or its actions.
We always have many options in the mind. Many choices are available for what we choose to think or how we choose to frame something.
A related idea that is not necessarily part of the above is if God or Dharma Protectors or some other being in a higher realm wanted to influence us, they would be most likely to do so by influencing our minds.
This influence could be a subtle guiding of our thoughts, actual channeling of their thoughts, or even a vision when we are alone.
When we are alone because in those moments the influence will be primarily on our minds not our bodies. Our eyes may see and our ears hear, but if no one else is there the influence will ultimately occur in our minds and remain in our minds as memory.
When we are alone because if another person is present and they see or hear the same thing, the influence will impact the physical world to a much greater extent.
It will not be contained within one human mind. Two people will be astounded by it, talk about it, share it with others. This extends the influence well into physical reality causing it to have a much wider impact.
Visions influencing more than one person have happened, but these should not be the standard of proof that events of that type do happen.
Indeed, it makes sense to assume that interventions into human affairs from higher realms happen to individuals far more often than to pairs or groups of people.
This also makes sense from the point of view that the locus of free will is in the mind.
A higher being can influence the mind and the will in this way without causing major distortions in the physical world.