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Maybe side mirrors not working properly. Or set to stay in out position, so they are in red because it won't allow you to over ride the setting from your phone app.
And we need sensors to inform us of this condition.
Turning your head slightly for visual verification is so last century.
To be fair to Porsche, it is on a phone app and seeing as how the average idiot on the road can't take their eyes off their phone even while driving, maybe not such a silly idea after all...
You mentioned that you left the vehicle at a shop. What it means is that the shop isn't stupid and left a window down in case the key got locked inside the vehicle.