How can I set to time zone used in the Date column of the Message List?

I have my operating system, and Thunderbird, set to the America/Vancouver time zone. When Pacific Daylight Time fell back to Pacific Standard Time on 1 November 2026, changing from UTC-7 to UTC-8 hours, our time zone remained unchanged at UTC-7 hours. Now I observe that the Date column of Thunderbird's Message List display shows the date and time of each message converted into UTC-8. But the message date as displayed in the right part of the header in the message pane is displayed in UTC-7. For instance, a message with the header `Date: Wed, 04 Nov 2026 09:27:27 +0000` shows in the Date column as "01:27" (today, 4 Nov), but the message date in the right part of the message pane reads "02:27". I cannot find a control or documentation which governs the time zone used by either the Date column or the message date in the right part of the message pane. How can I set to time zone used in the Date column of the Message List to use the America/Vancouver (or UTC-7) time zone of my operating system and of the Thunderbird calendar?