Free choice – thinking

Hello Rabbi,
The Rabbi distinguishes between freedom and liberty and mentions many times that free choice can only be made when we have several different values ​​and desires and within them the act of choosing takes place. But when it comes to the casual act of picking, then we really have no choice.
I wanted to ask, what happens to our thoughts/consciousness/the “thinking self”. Is the act of thinking subject to a relatively complete free choice? Or are thoughts also a primary result of the brain’s reflections, so that the act of choice occurs only when a thought conflicts with a value. For example, whether to continue thinking about forbidden reflections in relation to a religious value. Only there does the act of choice take place, but not in the actual process of thinking. This is because the power of choice does not generate new thoughts. Rather, everything comes from the reflections of our hearts and we only choose the thoughts.
Of course, I agree that there is a situation on all sides where the thoughts I think come from reflections, but my question is whether the power of choice creates a thought on a new topic. And whether this is a significant part of the cases.