Using 91.12.0
This is good, you just have to know how it works:
I check 9 e-mails in Unified view.
I see that if:
1.) I make all the column headers the same, on all of them
2.) I right-click Columns / Apply columns to / Folder and its children / Select the e-mail, at the top of the list
. . . then, they all get the same width size, real-time
I have four that I then change from "From" to "Recipient"
I see that those four are then, themselves, also all synced to the same width size too, real-time