There are two different type of themes pre-inbuilt already available for application builder.
Screenshot of Intellij android studio theme:
Screenshot of Dracula studio theme:
How to change UI theme in android studio.
1.Start android studio.
2. Click on File Menu > Settings. You can also settings by pressing CTRL + ALT + S .
3. Click on Appearance.
4. Now under UI Options you will find themes select any of them. Save selected theme by pressing Ok button.