how can I tell the fullbody IK setup to not trace the floor while my character is jumping, swimming or flying?
You can either connect it to a blend node in the AnimBP using a float to enable/disable, or inside the Control Rig you can use a float and connect it to the alphas of your IK setup, and modulate the float value when needed.
nice. what is the name of the actual node to use though? like the actual thing if you know what i mean
clarification
what is the node that allows the variables to communicate between the anim blueprint and the control rig and the character BP