Can you not share iCloud but everything else in apple
Do you have to share iCloud with everyone else in family sharing with apple+
iPhone 13 Pro, iOS 15
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The support document What is Family Sharing? provides lots of information on what is available with Family Sharing.
Which aspect are you enquiring about? If it is the shared iCloud+ space then yes, this is also part of family sharing. Each member of the group has access to as much space as they wish to use. See Share iCloud+ with your family
Note also Apple's comment in the first linked page: Each family member uses their own account, so everyone’s experience stays personalized and private.