low oil pressure

has anyone had the low oil pressure light come on when you have low oil pressure, like it's supposed to?...not counting when you put the car in accessory mode like the below photo shows...also please share how much oil was left in the car when the light came on...i assume the dipstick will not...

Concerns valid? I took my 2020 telluride to the dealer for a routine oil change yesterday. Once complete the car was pulled around to the customer parking area. However, as I was walking towards the vehicle the mechanic quickly returned it to the service area. I notice oil was draining from...