You can hide individual slides in your presentation from viewers. This is useful for storing drafts or keeping optional slides that you turn on or off depending on who you're presenting to. Hidden slides remain visible to you in the editor but are removed from all other presentation views, including PDF and offline exports.
Slide visibility can be toggled from the Slide Settings or by using the CMD+H keyboard shortcut. You can also show or hide slides by opening the arrange mode (ESC) and clicking the eye symbol.