Mail app is not showing "All Mailboxes" in Search in Tahoe.

Mail app is not showing "All Mailboxes" in Search in Tahoe. It was working until today. Weirdly, it shows up occasionally but not always. Clicking on the left tab bar, the All Mailboxes option simply disappears.

Any workaround or fix of this bug?

I'm on MBP 2022 running Tahoe.