(*Tested with 3.1* gnome-shell versions)
So you've installed FreeBSD (but you can use this guide even with Ubuntu :D if you want, or even with Fedora, Debain etc) with a x11/gnome3 as DE.
Primarily I always move window buttons to the left. To do this, enter
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gnomeshell extensions metadata.json
how to customize gnomeshell
outdated gnomeshell extensions