By default, an image which is fully visible within Photoshop can’t be scrolled/panned. This can be problematic if, for example, such an image is hidden behind panels. To enable such an image to be scrolled/panned, simply activate the Overscroll option from within the Tools section of the Preferences.
ORIGINAL IMAGE
https://unsplash.com/photos/qmxzyEJ1PSQ (Nathan Dumlao)