If you would like to use toggle ADS you should first verify the in-game settings are set to HOLD to aim and not toggle to aim. Also verify the game is using the default in-game button layout. Next, open your config and swipe to the ADS aim section of your config. Under activation check the toggle checkbox then expand this menu and set deactivation keys. These keys will return you to the Hip setting when pressed and help keep XIM in sync with the game. Common deactivation keys are change weapons, melee, sprint, throw grenade. Use what you feel would help you most.