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New guy here....ok after searching and looking in manual I cannot find this adjustment.
In the IS350/250 the Pop Up Display under Settings there is an option for Brightness. Can this setting not be adjusted? You can adjust the main instrument panel brightness for day or night but this seems to be a setting all its own. Page 89.
I had to go out to my car just to understand the question....holy crap that was a good one!
If I understand it correctly, the "Pop-Up Display" setting you've accessed as per Page 89 is an ON/OFF as to whether or not you want the Brightness meter displayed when you are adjusting the brightness.(don't even ask me why they give you the option to do this)
If you want to actually adjust the brightness, it would be the UP and DOWN arrows on the dash to the left of the steering wheel...next to the button that changes the Odometer to the Trip A/B.