My horse sometimes likes to follow the horse in front. How can I be in charge and also prevent that?

don't let him gey used to circles, walk on the side of another horse...control him, don't be controlled by him
Be calm yourself, and work the horse with your hands as if you had sponges in your hands, just to get the attention of the horse, then sit back and walk a few steps so the horse understands that he isn’t supposed to follow the other horse or run
Circles and half stops
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