Hello @Ji Li,
Thank you for reaching out to Atlassian Community!
The avatars on a Cloud site depend on what the own user selects on their profile.
If they select that only they can see or only a specific organization and you are not part of the organization, you will be able to see only their initials.
This is a personal choice and administrators can't change that.
If you have any other questions regarding this matter, please let us know.
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