Photoshop working area.
Updated 122123 with Photoshop 2024 and three 16x10 aspect ratio monitors on my new computer (buggy PS 2024 and all)
These three yield approximately 13" High x 63" Wide area of screen work space.
You are seeing an edit window on the left, a tools window in the middle and, in this case a few Internet browser windows on the right side

Click on 'Original' to see pixel for pixel or 'Auto' for Auto-fit to your screen.