Driver View (the one without steering wheel) is much dimmer at times compared to other views

I haven’t tested it on other cars, but when I was driving the Taycan with driver view, its much darker compared to all other views. It usually happens during the evening/raining/night.

Yeah same issue for me. Both on my 27" 1440p gaming monitor playing SDR as also on my LG OLED 65CX when playing in Dolby Vision.
It varies though. Sometimes the brightness is the same, but most of the times it’s much darker.