What action is required to ensure the fill color from a SmartArt diagram on another slide is used?

To use the fill color from a SmartArt diagram on another slide, utilizing the eyedropper tool is the most efficient method. The eyedropper allows you to sample a color directly from the SmartArt thumbnail or any other element on the screen. When you click and drag the eyedropper to the desired color, it instantly captures that exact hue, making it easy to maintain design consistency across slides.

This method is particularly useful because it eliminates the chance of a mismatch or having to navigate complex color picker options. By visually selecting the color, you ensure that it matches precisely with what you intend to replicate. This level of accuracy is key in design work, especially in presentation settings where visual coherence is important for audience engagement and overall aesthetic.