How To: Click the Apple logo available in the top-left corner of the screen, select Restart… and click Restart again to confirm your selection. The first thing that you should attempt to do in order to fix this is to restart your MacBook Pro computer and hope that a fresh start will make the Touch Bar display normally again. However, until Apple issues and official fix you can try to following troubleshooting tips: 1. This most likely is a software glitch that managed to find its way in the public release of macOS 11.0.1. 4 Ways To Fix macOS Big Sur Touch Bar Bug In both cases the digital buttons seem to be working normally, making this more a visual problem than a functional one. Other claim that the entire Touch bar doesn’t display. This macOS Big Sur bug is causing parts of your MacBook’s Pro Touch Bar to disappear. Is the Touch Bar on your MacBook Pro not working properly anymore ever since you updated to macOS 11.0.1? This seems to be a common issue, because multiple users have reported this problem to us, within the last 24 hours.

Macos Big Sur Touch Bar bug! Source: Reddit

How to turn on macbook pro no touch bar