Whenever you create a presentation with Microsoft PowerPoint, it opens the new presentation in the default theme. If you are not okay with the default theme and are bored of changing the theme every time you create a new presentation, then here is a small tip which will come in handy.
Launch the Microsoft PowerPoint and hit the Design tab and navigate to the Themes section.
Now right-click a theme and choose the Set as Default Theme option.
Now whenever you will create a new presentation, PowerPoint will open it with your specified theme.