I've recently checked my Google Account details on the Google Dashboard site.
The paragraph "Sites" told me that I have one Site and over 700 thousand sites "shared with me"
What are those "Shared with me" sites? How can I view them?
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As per what it means, here is the official explanation:
Share your site with other people
If your site is private, you can share your site to allow individual people to view or edit your site. If your site is public, your site will already be viewable by anyone, but you can share your site to allow other people to edit your site.