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The scroll bars are located at the bottom and right sides of an image and look like transparent light-grey sliders. When you move your cursor over them, they are highlighted. Using them, you can move across your image horizontally and vertically. This can be useful if you want to watch some details or areas of your image.
 
 
Note:  The scroll bars are active only if an image cannot be fully displayed in the Preview Area.
 
Note: The scroll bars disappear if the cursor is immovable for more than two seconds.