@Ac3Zodiac There are 2 simple ways in which you can achieve yaw control without a tail rotor:

1. you can add a gyro, and use the yaw power slider to use the gyro to yaw the
   aircraft

2. (My preferred way) you assign yaw as your input for collective
   pitch(alt), (make sure one blade has the input inverted), so that one blade increases collective and the other decreases, this creates a yaw moment.

Oh, well I tested and that seemed to be the problem

@Dogedogebread13 But I have two contra rotating main rotors, why cant it fly normally? Having this design makes a tail rotor not needed.

If you don’t want the tail rotor, just hide it too

Simple, attach the tail rotor on 1 side, the reason why it needs that is because the main rotor creates a much amount of torque which in turn spin very much the rotor