Shows the picture in it’s actual size. You can either use key controls or scroll controls to move around the picture. You can always double click on the picture to quickly see the whole picture full screen then press escape to come back to this display.
Selecting View then No Resize Options from the menu will bring up the following floating bar which will let you jump to various parts of the picture by clicking on the desired area with your mouse.
F4 will center the picture in the screen.