Sorry. I wanted to write free cache by pressing Free Bake button.
Rigid body cache have difficulties to unprotect itself.
So in timeline, cache representation can stay in an orange color. It means that it is still protected and would not be recomputed when playing animation.
You have to move an object in 3D viewport and cancel movement maybe one time or twice before cache becomes unprotected.
When its color becomes yellow in timeline, it means that is recognized as invalid and would be overwritten correctly by taking into account recent changes made to settings.