Question

what is the fastest way to change all of the slide layouts and colors of your presentation?
apply a transition.
manually change the colors and layouts on each slide.
modify the text boxes and pictures on the first slide.
apply a new theme.

Explanation:

Applying a new theme in presentation - software changes all slide layouts and colors at once. Transitions affect slide - to - slide movement, manual changes are time - consuming, and modifying first - slide elements doesn't change overall layout and color scheme.

Answer:

Apply a new theme.