Sophia here from Shopify. Are you able to share a screenshot of what the Online Store >Themes section of the admin looks like for you?
It sounds like the page isn't loading at all. If that's the case, please make sure that you're using a supported browser and that the browser is up to date. To rule out any potential browser issues, you can try another browser or device, or an Incognito window to troubleshoot. Let me know if that helps!
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