Chrome Browser on the youtube site problem
Apple updated my system but I was watching the videos online at the bottom of the page has left or right, loud CC is disappeared.
Firstly - there have not been any updates for High Sierra macOS 10.13 since November 2020.
Which is where your posting is appearing.
So what exact update are you referring to ?
Or does one mean upGrade and installing a newer version of macOS.
If it was an Upgrade to a newer version of macOS - this computer could not Automatically Install a newer version of macOS
Unless the computer may have been running Catalina macOS 10.15 and Qualified for Big Sur macOS 11 or Monterey macOS 12.
Writing an effective Apple Support Communities question
Is this a New Issue ? If Yes, what exactly changed on this computer ?
Is this an Old Issue ? If Yes, what actions has the user taken to fix this issue ?
Understand, we are all working Remotely from all around the world. Therefore, we do not have the On-Hands experience the User ( you ) has with this computer.
Reliable , accurate, details and context will really help to pinpoint a possible solution.