एवमुक्त्वा ततो राजन्महायोगेश्वरो हरिः।दर्शयामास पार्थाय परमं रूपमैश्वरम्॥
evam uktvā tato rājan mahā-yogeśvaro hariḥdarśayām āsa pārthāya paramaṃ rūpam aiśwaram
Word by word
The verse says
Sañjaya said: Having said this, king, the great lord of yoga then showed Arjuna his highest form as ruler of all.
In plain words
The narrator steps in, and it matters who he is talking to.
Sañjaya is reporting all of this to Dhṛtarāṣṭra, the blind king, back in the palace.
So the vision reaches us through a man describing it to somebody who cannot see, which is as close to our own position as the text can get.
Where you've felt this · in friendship
Your sister rings you from the top of a hill at the end of a long walk, because you could not come, and describes what she can see. You are three hundred miles away in a kitchen. For years afterwards, that view is the one she described to you on the phone that afternoon.
Going deeper
Everything in this chapter reaches the reader through two sets of borrowed eyes, and the text is careful to keep that visible.
Arjuna sees it with an eye he was given. Sañjaya sees it at a distance, by a gift of his own, and describes it to a man who has never seen anything. The reader is further out still. At no point does the chapter pretend to hand over the experience directly.
That honesty is unusual. A text wanting to overwhelm you would not keep reminding you that you are hearing a report of a report.
And it sets expectations correctly for what reading this can do. You are not going to have the vision by reading about it. What you can have is what Dhṛtarāṣṭra had — an accurate account from somebody who was there, which is how almost everything important reaches almost everybody.