How do I rotate the scene view around the Z-axis

My game is in 3D mode. It is a top-down game where the Z axis is the ‘gravity’ axis (not sure if that matters). The point being that I cannot for the life of me figure out how to keep the view looking downward while rotating (or orbit) the scene view around this axis. Hopefully the picture helps.

I want to be able to keep a top-down view while looking at this ship from the left.

Hi! Faced the same issue and finish with handful script wich does the job.
Hope it’ll help someone.

https://forum.unity.com/threads/change-scene-view-camera-rotation-axis-from-y-to-z.649624/
The general idea is to look at Unity’s own SceneViewMotion.cs

Thanks for the responses. It was as I feared – I started out creating my top-down game using a tutorial (ironically put out by folks at Unity) which had me switch the Y & Z axes for the sake of simplicity when thinking in terms of moving your player along the X & Y planes. However this ended up causing more headaches down the road when I started dealing with the editor camera, gravity, scaling, etc.

RobAnthem’s answer looked somewhat promising, but I didn’t really want to continue down the road of fighting the way Unity’s coordinate system works. In short, I went back and flipped my axes back to Unity’s default. It was somewhat of a pain and took me a couple days, but it’s working now and I feel better about the decision to bite the bullet and make the change.