I purchased or redeemed a bundle on Xbox, but I can't see the contents on the other Xbox Family profiles

When you redeem the bundle, it is only available on the Epic Games account connected to the Xbox, and you can only view it using other platforms connected to the same Epic Games profile. It is not possible to share the contents of a bundle between multiple Epic Games accounts.

To learn which items can be shared between platforms connected to the same Epic Games account, please refer to this article: What content is shared between my platforms in Fortnite?