To change the width of a rectangle without altering its height, Zach can:
a. Drag a corner sizing handle on the rectangle. By selecting and dragging a corner sizing handle, Zach can adjust the width independently of the height. This allows him to widen the rectangle without changing its overall proportions.
b. Drag a sizing handle on the left or the right side of the rectangle. Zach can also directly manipulate the width of the rectangle by selecting and dragging a sizing handle located on either the left or right side of the shape.
Both of these options enable Zach to increase the width of the rectangle while keeping its height unchanged. These methods are user-friendly and provide Zach with the flexibility to resize the rectangle according to his needs without affecting its original height.