Answer:
To make changes to the format of all your slides at once, using the Slide Master is probably the best idea. The Master is what controls how your slides will look: what fonts, colors, bullets, etc. that will be used on each slide.
Explanation:
Select the View tab, then click the Slide Master command. The presentation will switch to Slide Master view, and the Slide Master tab will be selected on the Ribbon.
Yes true he does use this kind of scale
