Both the "Total People" that you see when you click on the Donut Chart and the system smart list "All People" depict the number of known people (non-anonymous records) you have in the partition(s) that the selected workspace (I believe it's the Default workspace in your case) can see. Also, "Default" in the Database section where the assets are housed isn't a tab, it's the Workspace name. You might wanna give this product doc on Workspaces and Person Partitions a read. 🙂
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