What is the name of the feature in Microsoft Edge that allows users to customize the appearance of the browser with themes?

The feature in Microsoft Edge that allows users to customize the appearance of the browser with themes is called "Themes". Here are the steps to access and use this feature:

1. Open Microsoft Edge on your device.
2. Click on the three horizontal dots in the top right corner of the browser to open the settings menu.
3. In the settings menu, click on "Appearance".
4. Under the "Customize browser" section, you will find the "Theme" option.
5. Click on it and you will see a dropdown menu with different themes to choose from.
6. Select the theme you prefer and it will automatically be applied to your browser.

Remember, you can always change the theme whenever you want by following the same steps.