Changing Place in Kollel for a Mourner

Should a Kollel student in the year of mourning for his father change his place in the Beit Midrash where he studies, or does the rule of changing place apply only to the synagogue?

The custom is to change one's place only in the synagogue and not in the Beit Midrash.

In the Gemara Moed Katan, page 23a, it is stated: "Our Rabbis taught: A mourner, during the first week, does not leave the entrance of his house; during the second week, he goes out but does not sit in his place; during the third week, he sits in his place but does not speak; during the fourth week, he is like any other person." This is the answer to the custom of not sitting in one's place during the year of mourning, as written by the Rema in Siman 393, paragraph 4. Regarding the beginning of the Baraita about the first week, the Shulchan Aruch in Siman 393, paragraph 3, states: "The mourner does not go out on weekdays to the synagogue, but on Shabbat he does." The Rema adds: "And so to the Beit Midrash." This implies that the Baraita applies to both the synagogue and the Beit Midrash, and therefore, the answer for the second week, when he does not sit in his place, also applies to the Beit Midrash. However, the custom is that mourners do not sit in their place only in the synagogue and not in the Beit Midrash.