If your PC mouse has a wheel between the left and mouse button, one way to move the verticle scroll bar up and down is move the wheel toward you (scroll down) and away from you (scroll up).  Using the mouse wheel does not offer as much control of the scroll bar as other methods.

Another way to scroll is to use the keyboard.   Press the Down Arrow on the keypad to scroll down and the Up Arrow to scroll up.

Try both methods.

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