[Gentoo] How to appear minimize / maximize buttons to GNOME shell windows

Show button-layout
freeman@localhost ~ $ gsettings list-recursively | grep button-layout

org.gnome.desktop.wm.preferences button-layout 'menu:minimize,maximize,spacer,close'
org.cinnamon.desktop.wm.preferences button-layout 'menu:minimize,maximize,close'
org.cinnamon.muffin button-layout 'menu:minimize,maximize,close'

Set minimize / maximize / close buttons to GNOME shell windows
gsettings set org.cinnamon.muffin button-layout ‘menu:minimize,maximize,close’

Set close buttons to GNOME shell windows
gsettings set org.cinnamon.muffin button-layout ‘menu:close’

Reference:

• How do I add minimize / maximize buttons to GNOME shell windows?