Made a mistake? Well, nobody's perfect, right? ¯\_(ツ)_/¯
When making a mistake in your presentation, there are several options to revert the changes.
Reverting changes when working with text
Typing CTRL + Z or Command ⌘ + Z will undo the most recent changes made.
Reset an Element's position
After you drag and drop an Element in a slide, you can reset its position by clicking on it and selecting this option.
Deleting/moving a slide, changing a color palette, font or style or adding/removing an Element can't be undone.