Unnecessarily big union Selection Box?

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I cut the sphere with a part, now its selection box is like that. How do I fix it?

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Are you trying to change the size of the selection box in order to center the pivot? You can change the pivot point instead… otherwise I don’t believe you can change the selection box size because it still contains the negated part.

yeah i guess it is not possible

Always use a bigger Negated Part to cut Unions.
My guess is you have a very tiny spec of the original Sphere left at the bottom which still affects the Selection Box.
Undo the Union, make the Negated Part larger (make it a Part again to resize it more easily), and try to Union the Sphere and the larger Negated Part to see if that fix the issue.

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