I'm on Ubuntu 20.04, using the default desktop environment (Gnome 3, I guess?) and when I log out and back in again (or restart the computer, etc.) my open windows are gone.
How can I get Ubuntu to restore my open windows, like Mac OS does, and like other desktop environments (e. g. xfce) do on Linux?
I searched online and found this page, which says to run
gnome-session-properties, and then it shows an "Options" tab with a check box that says "Automatically remember running applications when logging out."
When I run
gnome-session-properties, that option does not exist:
How do I get this functionality?