Fit Mode

[A] or [Ctrl]+[A]

The image is displayed in full within the size of the box.

Use keyboard shortcut [A] to set all boxes to fit mode. Use [Ctrl]+[A] to switch only the selected box to fit mode.

100% mode

[Z] or [Ctrl]+[Z]

The image is displayed at 100%, meaning no shrinking or zooming is applied.

Use keyboard shortcut [Z] to set all boxes to 100% mode. Use [Ctrl]+[Z] to switch only the selected box to 100% mode.

Custom Zoom

[+] and [-]

or

[Ctrl]+[+] and [Ctrl]+[-]

The image is displayed in a zoom percentage other than 100%

You will enter the custom mode as soon as you change the zoom factor. By pressing keyboard shortcut [+] or [-] you will either zoom-in or zoom-out all boxes. By holding the [Ctrl] key pressed and then [+] or [-] you can zoom the selected box only in or out.

The zoom steps will allow you to zoom from 1% to 5000%.

Another way of zooming the box in or out is by using the mouse-scroll button. Place the mouse over any box and use the scroll button to zoom up or down.  If you hold the [Ctrl] key and then scroll the mouse up/down you will zoom just the selected box in and out.

[Alt]+[Z]

Press [Alt]+[Z] to open the Zoom Windows for each box. Then while hovering the mouse over an image, the Zoom Window will display a 100% view of the area surrounding the mouse cursor.