Being a Lexus noob, it is entirely possible that I'm wrong, maybe it's not the F Sport dials at all. My wife has the car at the moment so I can't take a photo of it, but I had taken a video of it earlier, not sure if I can attach it here but I'll try.
EDIT: Ok the video attachment didn't work, but here are some screencaps of it, sorry about the poor quality.
There is a button on the steering wheel to move the dial to the side and access the menu.