In Big Sur on MacBook Air in Mail
Cannot see flagged messages in Mail list on Macbook Air
I do not see how to select flagged and date received, both of which I would like to see.
thank you
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You may need to rebuild a mailbox to update the list of messages it contains. For example, if messages appear to be missing or garbled, or if you can’t find all relevant messages when you search using the Entire Message search option.
https://support.apple.com/guide/mail/rebuild-mailboxes-mlhlp1227/mac