How to turn off foot IK

Hello,

I've got some motion capture data I'm trying to play precisely in my Unity scene. When I preview it, the feet seem to get sucked to a center line directly under the character's body mass. The end result looks like both of his feet are lodged into one foot in the center line of his body. In the animation preview, with the cartoon character in the black jump suit, I can turn off the IK feet preview and his feet work just fine. I was wondering how to turn it off and apply it to the animation so the IK will be off during game time. I'm using a Humanoid rig.
Many thanks in advance
I'm sure there is probably a simple toggle for this and I'm just missing it so I apologize if this is common knowledge or covered before.