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This page lists popular configuration options.

APP MENUS ON WINDOW

That will move the application menu from GNOME Shell top bar, to application window itself, and it will place a new icon on the left side of title or CSD bar.

From GNOME Tweak Tool

Top Bar ->  Show Application Menu > Set to Off

That does 2 things. First removes the App Menu from GNOME Shell

org.gnome.settings-daemon.plugins.xsettings overrides {'Gtk/ShellShowsAppMenu': <0>}

Second it adds the menu on GTK apps ( Revisit this! )

org.gnome.desktop.wm.preferences button-layout 'appmenu:minimize,maximize,close'

ENABLE ALL WINDOW CONTROLS

By default GNOME will only use close button {x}. To enable minimize and maximize, from GNOME Tweak Tool

Windows -> Titlebar Buttons -> Set {Maximize, Minimize} to On

IF YOU WANT TO CHANGE THE ORDER

You need to use DCONF-EDITOR. Usually systems don’t ship it by default. If you don’t have it

$ sudo apt install dconf-editor

Navigate to

org.gnome.settings-daemon.plugins.xsettings overrides

And you should see something like

'{'Gtk/ShellShowsAppMenu': <0>}'

Now lets expand this value a bit by adding all the window controls

{'Gtk/ShellShowsAppMenu': <0>, 'Gtk/DecorationLayout': <'menu, :minimize,maximize,close'>}

The value is space sensitive!

That won’t change anything, and we don’t want to change anything yet! Now try re-arranging the controls adding close first

{'Gtk/ShellShowsAppMenu': <0>, 'Gtk/DecorationLayout': <'menu, :close,minimize,maximize'>}

Now you see the controls arrangement will be {x _ [ ])

If you want to move the close on the left side, you change

{'Gtk/ShellShowsAppMenu': <0>, 'Gtk/DecorationLayout': <'close,menu:minimize,maximize'>}

That will work only for GTK Windows. If you want to apply the changes to everything, and for example to move all the controls to the left like Ubuntu, set

org.gnome.desktop.wm.preferences button-layout 'close,maximize,minimize,appmenu:'

and

org.gnome.settings-daemon.plugins.xsettings overrides {'Gtk/ShellShowsAppMenu': <0>}

From CLI you can simply give these two

$ gsettings set org.gnome.desktop.wm.preferences button-layout 'close,maximize,minimize,appmenu:'
$ gsettings set org.gnome.settings-daemon.plugins.xsettings overrides "{'Gtk/ShellShowsAppMenu': <0>}"

This guide needs a rewrite, but you get the point!

SET GLOBAL GTK THEME TO DARK

From GNOME Tweak Tool

Appearance -> Global Dark Theme -> Set to On

That actually adding

$ less ~/.config/gtk-3.0

[Settings]
gtk-application-prefer-dark-theme=1

If you want the root user have dark theme too, you can edit root’s GTK config

Notice the changes to be applied need restart. Some apps like Nautilus don’t close by {x}. You need to kill it and start it again