As it turns out, the pop-up warning before removing a font family in FontBook is quite handy for accidental clicks. After choosing to not show the warning message previously, how do I re-enable this function? There seems to be nothing in FontBook prefences that addresses this.

1 Answer 1


Tested in macOS Catalina, with Font Book closed, from Terminal:

defaults delete com.apple.FontBook FBRemoveFontsFromLibrary

Allows this dialog box to show again:

enter image description here

  • 1
    Thanks, @user3439894. This was most helpful.
    – nicheese
    Jul 30, 2021 at 1:24

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