तत्रैकस्थं जगत्कृत्स्नं प्रविभक्तमनेकधा।अपश्यद्देवदेवस्य शरीरे पाण्डवस्तदा॥
tatraika-sthaṃ jagat kṛtsnaṃ pravibhaktam anekadhāapaśyad deva-devasya śarīre pāṇḍavas tadā
Word by word
The verse says
There, standing in one place in the body of the god of gods, the son of Pāṇḍu saw the whole world, divided into its many kinds.
In plain words
The promise from verse seven is kept, exactly.
The whole world, in one place, and still divided into all its separate kinds.
Both at once: everything together, and nothing blurred into anything else.
Where you've felt this · in study
You fly over the city you live in on a clear morning. You can see your own street and the school and the roundabout you hate, all at the same time, all exactly where they are. Nothing has merged. What is new is that they are no longer separate journeys.
Going deeper
Unity that does not erase difference is the precise thing being described, and it is harder to picture than either of the alternatives.
One common idea of the divine whole has everything dissolving into an undifferentiated unity, where distinctions turn out to be illusions. Another keeps everything separate and adds a ruler over the top. This verse says neither. The whole world is in one place, and it is still pravibhaktam anekadhā — divided in many ways, with its kinds intact.
That matches what Chapter 9 said twice over, when it insisted that beings rest in him and also do not, and then pointed at the contradiction instead of resolving it.
For a reader the useful end of this is about your own particularity. Nothing in this vision suggests that being one specific person, with a specific life, is a mistake to be corrected. The divisions are in the picture. They are just no longer the whole of it.