Is filling the gaps in the rows obligatory or a recommended practice?

Question : In the name of Allah, the Most Gracious, the Most Merciful. Yes. By Allah the Mighty, let me wake up and come back.

Answer : No, no, it is a recommended practice, a recommended practice, except according to the view that opening the gap is forbidden, in which case it becomes obligatory. And in any case, the view that aligning the rows and closing the gaps is obligatory is a strong view, but I have some reservations about it in my heart.