Q. Does an Avel seating in the corner of the last row in shul have to move to another place, while in mourning, since as is he is already seating at a least respected seat?
How about an Avel who only comes to daven on a Shul on Shabbos, does he also have to change seat, then? If yes, why is this not a case of Avelus Befarhesia or public mourning
that is not permitted on Shabbos?
A. Horav Shlomo Miller's Shlit'a opinion is that the Avel should change his seat even if it is only sideways.
The Rov added that even if he only attends this shul on Shabbos, he should still change place. The reason being that since he will likely be davening there before Shabbos begins and at the end after Maariv, it is a not considered an Avelus of Shabbos.
Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller and Horav Chanoch Ehrentreu Shlit'a