2.1.5.3. Contrast
2.2. Apply slide size and orientation settings
2.2.1. Set up a custom size
2.2.2. Change the orientation
2.3. Add and remove slides
2.3.1. Insert an outline
2.3.2. Reuse slides from a saved presentation
2.3.3. Reuse slides from a slide library
2.3.4. Duplicate selected slides
2.3.5. Delete multiple slides simultaneously
2.3.6. Include non-contiguous slides in a presentation
2.4. Format slides
2.4.1. Format sections
2.4.2. Modify themes
2.4.3. Switch to a different slide layout
2.4.4. Apply formatting to a slide
2.4.4.1. Fill color
2.4.4.2. Gradient
2.4.4.3. Picture