Here we have the possibility of Zooming with greater precision we have here Zoom 2x... actual size (1x)... note the keyboard shortcuts that are the elements on the right of the menu the actual image size (1x) shortcut is "cmd+1" if I want to maximize any Pane, press the space bar it'll open that panel in full screen pressing "f" and "h" fit the images in the Viewer you are zoomed here, press "f" and it fits the image and the "h" will put the image at the largest possible size in the Viewer press "space" to return to the original layout 