When designing a slide, you often have to rearrange objects as you introduce a new design. And if you ever needed to move an object in only one direction (either horizontally or vertically, but not both), then you know that it can be a real pain in the neck using the mouse. If you select the object and drag it using your mouse, no matter how careful you are, usually the object shifts slightly in an unintended direction. Alternately, you can select the object and move it using the arrow keys to keep the object in line, but if you need to move the object clear across the slide, then this is an impractical and time-consuming method.
Fortunately, PowerPoint has a simple key command that can help you keep your objects in line. Simply select your object and hold down [Shift] as you drag the object either vertically or horizontally with your mouse. Since PowerPoint doesn’t know which direction you want to move the object, initially it may jump a bit, but as you continue dragging in the desired direction it will fall back in line.