Zooming an image/video in the program monitor

I recently stumbled upon something I've never noticed in Premiere before which was a huge game changer. It happened while I was pinching to zoom as I usually would, but rather than zooming the monitor it actually enlarged the scale of my video. This is actually super helpful because I was then able to move the video around. I have no idea how I did this, I've tried everything possible.

Does anyone know what it might be?