Was anything reported concerning the distance between the feet during standing in the postures of the prayer of the Messenger of Allah, may Allah's prayers and peace be upon him?

There is no mention of a specific distance between the feet in the prayer of the Prophet, peace and blessings be upon him. Scholars have recommended relying on both feet and maintaining moderation while standing. They disliked relying on one foot or joining the feet together, as that contradicts the proper posture of prayer. The Sunnah is not to align the feet, and there is no harm in shifting weight between them when needed.