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Hi Sandi-MPC,
I understand your situation but based on my seach, I didn't find a way to edit the filter in the problematic view. The only option I suppose is to create a new All Items views which will allow you to edit the view and see all the items.
Besides, if you want to find the root cause, I will suggest you contact your tenant admin to create a support ticket to Microsoft. We really want to help but we don’t have any resource or escalation channel to escalate this case further. Sorry for not being able to help here.
Once you reach the assisted support for the request, they will help you find the root cause, the support there can also contact the related team if necessary. To create support ticket, admin can go to Microsoft 365 Admin center>Support>New service request. You may also refer to Contact support for business products - Admin Help.
Thanks for understanding. Have a nice day and stay safe.
Kind Regards,
Neha