I'm reading this article, it works.

But how can I turn off macOS Mojave screenshot preview thumbnails with defaults write command?

I just don't know the key value to use.

up vote 2 down vote accepted

The domain is com.apple.screencapture and the key is show-thumbnail. So:

defaults write com.apple.screencapture show-thumbnail -bool TRUE

and

defaults write com.apple.screencapture show-thumbnail -bool FALSE

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