Date and time column in mail disappeared and won't come back

This is on Ventura 13.6.9 on an iMac 27. Nothing changed hardware or software wise. The date and time column in column layout for mail disappeared and I can't get it back. I click on 'view show date and time' to turn it on and off and nothing, no date and time column. I've rebooted, changed 'view use column layout' on and off and no date and time column.