/usr/share/themes/Greybird/gtk-3.0/settings.ini is in greybird-gtk-theme 3.22.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Settings]
gtk-auto-mnemonics = 1
gtk-visible-focus = automatic
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