Lost drawing now only see large solid line rectangle inside a dashedline rectangle

I was working on a floor plan this morning when all of the sudden the screen jumps to an image of blank white sheet with a solid line rectangle inside of a dashed line rectangle. The rectangles fill up most of the screen. I have no idea what is going on. Can anyone help? There is noting else n the screen

Did you switch from Model Space to a Layout by mistake?

There should be two tabs near the bottom of your screen. Click on the one that says Model.

Thanks, apparently that is what I did