scene window is messed up

Hello.
I don’t know how I ended up with the scene window acting like:

  • the little cube in the center of the transform gizmo is supposed to return to free view; instead, it switches between perspective and ortho (little persp/ortho just below it still does the same, as supposed);
  • view is supposed to rotate about the focused object (let’s call the center (0.5, 0.5) in screen coordinates of the scene window); instead, it appears to rotate about (0.5, 1), no matter what I do (zoom, rotate, pan).
    I checked Unity prefs but didn’t find anything related.
    Any ideas (besides reinstall)?

Did you setup your project in 2D mode instead of 3D?