I have multiple Gmail email accounts and just purchased a Windows 11 computer. Upon installing and opening Thunderbird and adding my accounts, I discovered the first Gmail account inbox does not retain READ emails like it always had before. After reading them, they disappear and are only viewable in the All Mail folder. It seems I can only view UNREAD emails in my first account's inbox. However, the second and third Gmail accounts DO retain READ emails in their inboxes.