Keyboard backlight UI stuck on Touch Bar MacBook Pro Whenever I try to increase or decrease the brightness of the keyboard backlight — using the Touch Bar on my MacBook Pro (macOS Catalina) — the GUI just shows this:



What does this mean? Is some hardware broken, or just a software bug?
You can also use a Terminal command to refresh the Touch Bar. 


Launch Terminal
Type in the command pkill "Touch Bar agent" and hit Return. 


It should help you to fix this issue.