Vertical size controls the height of the display area. The maximum height is governed by the vertical size monitor screen. The vertical height should be adjusted to fit the display area between the upper and lower boundaries of the screen. Too little vertical height results in large areas of black at the top or bottom of the screen or both. Too much vertical height results in the display extending beyond the physical boundaries of the monitor screen and the loss of viewable information.
Horizontal size controls the width of the display area.
The maximum width is determined by the size of the monitor screen. The horizontal size should be adjusted to fit the display area within the right and left boundaries of the screen. Like the vertical size, maladjusted horizontal size can result in bands of black at the edges or the display extending beyond the physical limits of the screen. Vertical position controls the up and down position of the display relative to the physical screen area. Use this control if the upper or lower edge of the display is beyond the physical edge of the screen and there is a black band at the opposite edge.