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If a Memorized Report was created by another user and is not visible on your end, this means you don't have access to view these reports.
Only the admin and users who have been granted permission can delete memorized reports. You can reach out to your Primary or Company admin to request permission to view and delete these reports.
For your future reference, you can visit this article to learn how to export your report to Microsoft Excel from QuickBooks Online: Export your reports to Excel from QuickBooks Online.
Before we wrap up, I recommend checking out our QuickBooks Live Expert Assisted. They are dedicated bookkeepers that can bring your past books up to date and manage your bookkeeping for you from start to finish.
Please feel free to return to this thread if you have any additional questions or concerns.