how can the sun and moon be folded

Collection Sahih Bukhari Dar-us-Salam reference Hadith 3200 In-book reference Book 59, Hadith 11 USC-MSA web (English) reference Volume 4, Book 54, Hadith 422 Narrated Abu Huraira: The Prophet (ﷺ) said, "The sun and the moon will be folded up (deprived of their light) on the Day of Resurrection." This hadith says the sun and moon will be folded and the explanations say Takwir means folding a turban or garment. this will cause it to lose its light. if the sun and moon are spheres then how can it be folded. does this mean sun and moon are flat disks? is there anything to prove against it being flat? The quran is surah Takwir also says the sun will be folded