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Create Symbol is not highlighted when I am trying to create a collection item layout into a symbol

I have a collection item that shows content from a CMS. I want this to appear in the same format in multiple pages. I was trying to create a symbol so I can reuse the component. but when I select the collection item or even the content inside it the “Create symbol” sign seems to be disabled. I am trying to do it from a CMS item template page.