Slide Master is used to make changes on _________.

The Slide Master is a feature in presentation software (like Microsoft PowerPoint or Google Slides) that stores information about the theme and slide layouts of a presentation, including the background, color, fonts, effects, placeholder sizes, and positioning.

When you make a change to the Slide Master, that change is automatically applied to all the slides that are based on that master. This ensures visual consistency across the entire presentation and saves time, as you don't have to modify every slide individually.