It appears that Sanjaya also, by the grace of Vyasa, could see the universal form of Krsna exhibited to Arjuna. It is, of course, said that Lord Krsna never exhibited such a form before. BG 1972 purports

Expressions researched:
"It appears that Sañjaya also, by the grace of Vyāsa, could see the universal form of Kṛṣṇa exhibited to Arjuna. It is, of course, said that Lord Kṛṣṇa never exhibited such a form before"

Bhagavad-gita As it is

BG Chapters 13 - 18

It appears that Sañjaya also, by the grace of Vyāsa, could see the universal form of Kṛṣṇa exhibited to Arjuna. It is, of course, said that Lord Kṛṣṇa never exhibited such a form before. It was exhibited to Arjuna only, yet some great devotees could also see the universal form of Kṛṣṇa when it was shown to Arjuna, and Vyāsa was one of them. He is one of the great devotees of the Lord, and he is considered to be a powerful incarnation of Kṛṣṇa.

BG 18.77 (1972), Translation and Purport

O King, when I remember the wonderful form of Lord Kṛṣṇa, I am struck with even greater wonder, and I rejoice again and again.

It appears that Sañjaya also, by the grace of Vyāsa, could see the universal form of Kṛṣṇa exhibited to Arjuna. It is, of course, said that Lord Kṛṣṇa never exhibited such a form before. It was exhibited to Arjuna only, yet some great devotees could also see the universal form of Kṛṣṇa when it was shown to Arjuna, and Vyāsa was one of them. He is one of the great devotees of the Lord, and he is considered to be a powerful incarnation of Kṛṣṇa. Vyāsa disclosed this to his disciple, Sañjaya, who remembered that wonderful form of Kṛṣṇa exhibited to Arjuna and enjoyed it repeatedly.