Redoc using three column layout

I want to use redoc for documentating an open api together with django rest framework. When I look at the documentation of redoc on github they show screenshots of redoc using three columns. With the code on the right in a sticky div.

I would like to use this layout but standard configuration of redoc (as described on DRF documentation, and on github's instructions it opens up a layout with only two columns. I briefly tried to look at the javascript/page on the demo page but looks like they are referencing a different demo.bundle.

Does anybody have an idea what I'd need to do get a redoc in a three-column layout? I could make my own react build probably but I was hoping it could be done in a simpler way?