What is the method to change an animation effect so the diagram animates one by one?

The correct approach to change an animation effect so that the diagram animates one by one is to click on the effect options in the animation group and select the "by one" setting. This function allows the user to customize how each element of the diagram appears during the presentation, making the animation more dynamic and engaging.

Selecting the "by one" option means that each part of the diagram will be delivered in sequence, rather than all at once, allowing for a more controlled and deliberate presentation style. This is particularly helpful in emphasizing each component of the diagram as it is revealed, facilitating better audience understanding.

Other approaches listed would not effectively achieve the same outcome. For instance, right-clicking to select an animation only provides a limited set of options and does not specifically allow for a one-by-one animation setting. Similarly, using the short menu or dragging and dropping animation effects does not lead to the specific customization required for animating elements in the desired sequential manner.