Comment by dwaite

> Years ago, they changed the behavior of the green button to be "fullscreen into a separate space."

Not quite. It has the old behavior (grow to as large a window as supported) if the app does not support full-screen. For instance, the Settings app cannot grow wider, so it grows to full screen height.

The icon that appears when you hover over the green button reflects whether it is full screen or zoom behavior. If you hold option, you will always get zoom behavior IIRC. However, due to the green button being overridden to be a menu in Tahoe, the button icon may or may not reflect zoom/full screen behavior if you press/release option and may instead show the optional modifier on the options in the pop-up menu.

I do not believe there is a way to disable full screen behavior completely, nor spaces. However, I don't think I'd be able to survive working on a Mac without both so I haven't done a lot of investigation there.