Curves surfaces become square when panning / rotating

I did something in rhino command settings and now objects become square when panning / rotating. I did not change any options settings.
Anyone know how this happened? see screenshot:

In the Display options (right side panel), make sure that the BBox Display options is deactivated.

Activating it will “square” your objects during navigation to speed up the visual feedback.

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thanks that did it. It was driving me nuts.