Choose Slide - Slide Properties.

Choose Slide - Slide Properties and then click the Slide tab.

Choose Slide - Slide Properties and then click the Background tab.

Choose Slide - Layout.

Choose Slide - Change Slide Master.

Choose Slide - Change Slide Master - Load.

Choose Slide - New Slide.

프레젠테이션 도구 모음에서 다음을 클릭합니다.