The Hand tool is designed to scroll the displayed area of the image in the window if the whole image doesn't fit into the window at the chosen scale. To move the image you should press this button, put the cursor onto the image, press the left button and, keeping it pressed, move the image in the window.
To scroll the image in the Image Window you can also press the spacebar on the keyboard and drag the image with the left mouse button.
is designed to scroll the displayed area of the image in the window if the whole image doesn't fit into the window at the chosen scale. To move the image you should press this button, put the cursor onto the image, press the left button and, keeping it pressed, move the image in the window.
— Hand