You should position two tracks differently, one to the left and one to the right. Those tracks need also croppings to have the interesting part visible. See for ex. this tutorial video:

There's more of them, search for "Premiere split screen".

You should position two tracks differently, one to the left and one to the right. Those tracks need also croppings to have the interesting part visible. See for ex. this tutorial video: Adobe Premiere Pro Tutorial: How to create Split Screen Side by Side Video Effect.

There's more of them, search for “Premiere split screen”.