Which is better during the congregational

Q 3: In the Masjid (mosque), and after the first row is complete by worshippers, a small number of people who constitute less than one row remain, Should they stand on the right side of the second row so as to get the reward of offering Salah (prayer) on the right side? Or should they stand behind the Imam, having the front row completed, and knowing that the area of the Masjid is medium if not small?

(Part No. 7; Page No. 422) A: If the case is as you mentioned, a second row should be established starting from behind the Imam, whether the Masjid's area is small, medium or large.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.