Question Scene View constantly auto-refocusing... Aaaaargh!!!

In Unity 2021.2.4 any time a different object is selected, the Scene View automatically repositions to center on that object's pivot -- as if I'd pressed the F hotkey. Sometimes, I can see this would be useful behavior to turn on, but right now this is driving me crazy! --And I can't find any way of turning it off.

Is there a hotkey or option switch somewhere? If not, the editor badly needs this to be an option.

 

This was happening while working on an animation in prefab mode. Every time I selected a different property in the Animation panel, the Scene View would jump to a closeup on whatever object I'd selected, and I'd have to constantly zoom back out. I also found that the Move Tool would be automatically selected, adding to the frustration of adjusting rotations in a group of objects.

...but somehow all of this has stopped happening. No idea why.