Rotation - not instance

I have a snake model and the center is at the base of the head. When I rotate it to flip it in the opposite direction, I can see the rotation on the screen. It is not instant. I’m not sure if the animation sequence is causing this issue, but I want to flip it without out it be visible, from one frame to the next to be rotate, it is playing animation during this time.

How do I achieve this, do I stop animation and do rotation and then start it again or is there something else?