The relative Unseen is so with reference to a particular person, because of the intervention of Time, Space, or particular circumstances.
https://www.islamhelpline.net/quran/72/26
" When the Holy Prophet asked what it was, they said that if he would worship their gods, Lat and Uzza, for a year, they would worship his God for the same space of time.
https://www.islamhelpline.net/quran/109/0
But here we witness quite another phenomenon. The Messenger of Allah in a brief space of 23 years revolutionized an entire nation as regards its beliefs, thoughts, customs, morals, civilization,
https://www.islamhelpline.net/quran/110/0