Presets category allows you to save all Rig Tools settings into a preset in order to load them at any moment. You can find Presets category on the bottom of the Rig Tools window.
Save Rig Settings – save Rig Tools window settings to Project\Saved\SaveGames folder.
Save Preset Name – name for a new preset file.
Load Rig Settings – load Rig Tools window settings from Project\Saved\SaveGames folder.
Currently, preset system is implemented by SaveGameObject. You can find or add your preset files under YourProjectName\Saved\SaveGames\ folder.
Preset file does not depend on engine version.