I suppose another option is to leave the car running for the few minutes that you are in a store or wherever. I normally don't like to leave a car running unattended but I know some people do for air conditioning instead of using remote climate. In fact with low EV range that would be the only way since remote climate doesn't work if EV range is too low. Although if I did leave the car running I wouldn't want to attract attention to it, but there is no way to turn off the display while the car is running. Also the DRL's will be on and quite noticeable, unless you had manually set the parking brake prior to turning off the car on your previous trip. If not the only way to turn off the DRL's is to set the parking brake, then turn the car off and back on again .... but now your EV range will be 0!