Title bar settings missing in GNOME Tweaks on Ubuntu 20.04

I tried to move my "close, minimise and maximise" to the right + add the macOS theme to it. However, I have not been able to find any settings for that. In GNOME Tweaks > Windows the settings to put the buttons to the right are missing completely.

In the GNOME Tweaks window look under 'Window Titlebars' section, instead of 'Windows' section:

You can also achieve your goal simply using the command-line. To move the window buttons to the right, launch Terminal and just run the following command

gsettings set org.gnome.desktop.wm.preferences button-layout :minimize,maximize,close