How to keep screen from flashing?

The built-in monitor on my MacBook Air flashes to full painful brightness when I disconnect from an external monitor. How do I avoid this? I have visual issues and bright lights and flashing lights are both very painful.

Michael Levin wrote:
Ok, but no way to leave the timer visible in the lock screen?
No
And, if I turn off the autolock, won't the screen still dim (and then go off) after a while?
No, if you set it to never, then the screen will never dim.

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