Sort by dropdown in Mail

You are correct.

Here's what I see in Catalina:

But that pop-up is gone with Big Sur and I can't find any way to add it back.

Looks like the View > Sort By menu is it for sorting.

Of course, if you know the user's name you could "Filter" the Inbox with a search in the Search field.

ivan

Howdy,

It sounds like you are viewing your mail with Column View. If so you can click on a column heading to sort by that column.

Note there is a "v" or "^" at the right of the column heading showing the direction of the sort for that column. Clicking on the column heading again reverses the sort.

ivan