Can't see all of touchbar
The right side of my touch bar disappeared. I can only see the left side. How do I fix this?
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Check if you have same issue in safe mode.
https://support.apple.com/en-us/HT201262
Note: Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS, and fonts not installed by macOS. It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. And it deletes some system caches, including font caches and the kernel cache, which are automatically created again as needed.
Have you tried below resets, if not perform and see if it helps.
How to reset the SMC of your Mac: https://support.apple.com/en-us/HT201295
Reset NVRAM or PRAM on your Mac: https://support.apple.com/en-us/HT204063
If above didn't help then there maybe a hardware issue with touch bar.