Allah Almighty has form. He is not formless. But no one knows what that size is. Allah says,
لَیۡسَ کَمِثۡلِہٖ شَیۡءٌ ۚ وَ ہُوَ السَّمِیۡعُ الۡبَصِیۡرُ
“There is nothing like Him, He is All-Hearing, All-Seeing”
He will be seen in Paradise. And this is the greatest happiness of heaven. The Holy Prophet (ﷺ) saw Allah in a dream. He said, “I saw my Lord in the most beautiful form.”
[Sahih ul Ja’me 59]
And what is seen is not formless.