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The knees bend sideways instead of forward and backward(normal) I tried:
"Recalculate Roll > View Axis" but that didn't do anything. How to fix it?
I'm not sure how to embed the GIF:
You need to set the IK Pole Target and pole angle. Follow JerryNo's answers How to IK rig legs and How to Set/Calculate pole angle of IK constraint
Required, but never shown