It's great to hear that you're becoming more comfortable with your BMW iX and discovering new features along the way. The ability to let the battery level go below 20% without feeling the need to immediately charge is a positive sign of growing confidence in the vehicle's range and performance.
Discovering the mute function for the sound system by pressing the scroll wheel on the center console and the automatic lowering of the passenger mirror in reverse are handy features that can enhance your driving experience. It's always interesting to find these hidden gems in a car's functionality.
It's understandable that the size of the iX may take some getting used to, especially if it's larger than what your wife prefers for everyday driving. However, her willingness to take it to the store shows that she's open to giving it a chance, and who knows, it might indeed grow on her over time.