Hey there @Carol S.33,
From what you mention it sounds like these folders have been shared previously and then perhaps the other members have been removed, leaving you as the only member but a folder that technically is still shared.
You can unshare these folders (if you are indeed the owner of them) and in doing so, the folder will remain in your account and no longer show the silhouette of 2 people indicating a shared folder.
Let me know how you get on with this - Cheers!
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