The Controls tab and Custom Rig tab in the HumanIK window can be customized to accommodate your workflow or animation rig.
You can make changes to each layout by editing XML configuration files located in the CharacterControls directory (C:\Program Files\Autodesk\<Maya version>\resources\CharacterControls).
The configuration files are built around the views in the
Controls tab (Full Body, Hands, and Feet) and the
Custom Rig tab (Full Body, Spine, and Neck):
