How do I quit/delete a workspace if I'm not the owner?

A customer of ours created a workspace years ago for a project I was a part of, however that customer has since gone out of business and this workspace is now cluttering up my "All Workspaces" list. Because they went out of business, the owner of the sheet cannot delete it or remove me.
Is there any way to quit this workspace if I'm not the owner and they cannot be contacted?
Answers
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You can access the workspace sharing, navigate to your name, then select the option from the dropdown next to your name to "remove me from sharing".
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In the share settings, it says I'm an "Editor - Can Share" and the only other option for me to do is to "Request admin access" but obviously that request will fall on deaf ears if the admin of the workspace no longer works for that company/has access to the account.
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Can you provide a screenshot that shows what you see if you go to the Browse tab on the right toolbar, right click on the workspace name on the left side of the screen, and then click on "Share"?
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That's interesting. I haven't run into that before. You may need to reach out to support.