Customize text formatting: Instead of changing the text color on each slide individually, you could use the master template editor to change the text color on all slides at once.When you adjust one of the layouts in the master template editor, all of the slides with that layout will change. Rearrange placeholders: If you find that you often rearrange the placeholders on each slide, you can save time by rearranging them in the master template editor instead.For example, you could add a watermark or logo to each slide in your presentation, or you could modify the background graphics of an existing theme. Modify backgrounds: The master template editor makes it easy to customize the background for all of your slides at the same time.Here are some common uses for the master template editor. You can also modify individual slide layouts, which will change any slides using those layouts. From there, you can edit the master slide, which will affect every slide in the presentation. The master template editor in Google Slides allows you to quickly modify the slides and slide layouts in your presentation.