How to rotate collider?

Im trying to add collider to my gameobject but when i add it it is in a strange rotation
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When i add same collider to child mesh its rotation is symmetrical with the actual mesh but i need that collider in the parent object.
Any ides?

From what I understand in this forrum

You need to place your object in the orientation of the world , than you add the collider , finaly you can move them toguether as you want.

I hope this helps!