2. Secondly, after completing the above steps, click the page with the right mouse button, as shown in the figure below, and then enter the next step.

3. Then, after completing the above steps, select the option of setting the background format, as shown in the figure below, and then enter the next step.

4. Then, after completing the above steps, click the fill color on the right, as shown in the figure below, and then go to the next step.

5. Then, after completing the above steps, select the color of the rolling wheat wave, as shown in the figure below, and then enter the next step.

6. Finally, after completing the above steps, the background color of the slide has been changed to the color of the wheat wave rolling, as shown in the figure below. In this way, the problem is solved.