Shulchan Menachem. We are learning Chapter Reish Lamed Hei, 235, discussing the proper manner of reciting Kiddush on the night of Pesach.
There are different customs regarding whether Kiddush is recited standing or sitting. However, the Chabad minhag, as brought in Shulchan Aruch HaRav, is to always recite Kiddush while standing—on Shabbos, Yom Tov, and Pesach alike.
This practice is rooted in Kabbalistic sources, such as Pri Etz Chaim and Mishnas Chassidim, which emphasize standing for Kiddush.
There are opinions noted that even those who normally stand for Kiddush throughout the year should sit on the night of Pesach, possibly connected to the theme of cheirus, expressing freedom through a more relaxed posture.
Nevertheless, the Alter Rebbe writes that one should maintain the same practice and recite Kiddush standing even on Pesach. The consistency of the minhag, especially as established by the Alter Rebbe, takes precedence.
Thus, the Chabad custom remains to stand for Kiddush at all times, including the Seder night.
Summary
Although some suggest sitting for Kiddush on Pesach to reflect freedom, the Alter Rebbe rules to maintain the custom of standing. Chabad practice follows this consistently for all Kiddushim, including Pesach.