In prototyping an app screen I would like to show and navigate between multiple overlay screens, but swap overlay has push and other greyed out.

But if you use Navigate to its available.

I have found a hack where you use the Navigate to > Push on the screens then go back and change the Navigate to back to Swap overlay and it retains the Push option.
Again, not sure if this is a bug or deliberate. would be nice to have the Push option not greyed out for Swap Overlay.