In Unity, find the SkeletonDataAsset file in Unity in your Project view. (the icon is the orange Spine icon)
Change the Scale
. 0.01 should be a good number.
If it's still too big, make the number smaller: try 0.001.
Make sure you let it reload if you don't see the changes. Try to reopen the Scene, or click Reload on the SkeletonAnimation component.