Title bar buttons for Gnome apps

I installed the ubuntu-unity-desktop on a fresh install of Ubuntu 23.04. Whenever I open a Gnome app under Unity, the window title bar is missing and the usual close-minimise-maximise buttons are absent. The apps seem to have their own version of the window title bar so moving the windows around with the mouse is possible. But the missing buttons hurt.

Apps that exhibit this issue include: nautilus, gnome-text-editor, gnome-calculator.
Luckily the gnome-terminal works fine.

Is there some way to tweak the settings so the lose-minimise-maximise buttons are displayed for these apps again?