iCloud
Is the storage included with Apple One shared with other family members?
Can a family member see what is stored by another member?
MacBook Air 13″, macOS 12.3
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It is only shared if you choose to share it. See: Share iCloud+ with your family - Apple Support
Also see the following from Share iCloud+ with your family - Apple Support
When you share an iCloud+ subscription, everyone in the family group uses their own account. That way your photos, documents, and other information stay private, even though you're sharing access to the service. You simply share the features and space available in iCloud+ with your family members, so you only have one plan to manage.