Organization Admins act as Project Admin on every project, without being added to it.
What each role can do
If explicit account access is enabled, a Project Admin can only view other people’s accounts until granted a role on them.
Related
Who Can Grant Access
Which accounts a Project Member can hand to an AI platform.
Connector Profile Access
Limit who can link accounts through a sensitive connector profile.
Shared Accounts
Let several people work through one linked account.