When using my phone in the car I put it in a car holder. The holder is horizontal in order to have better view for navigation etc. I use spotify also a lot in the car but when using the playing music I'm not able to rotate the screen but the playlists dose rotate
We really appreciate your reports on this.
We just wanted to let you know that the right folks have taken a look at this for you, and what you're seeing right now is explained here.
Right now, we're not able to provide an exact timeline for a change, but we'd recommend always keeping your Spotify app up to date to ensure you're on the latest version with fixes and new features.