If you use Pro version of the web part, you can use more themes.
Note: themes may be shown in different way if current version of your browser is not supported.
You can check the box “Show debug information” to display debug information in the web part.
Once you have adjusted the web part, click “OK” to apply all the settings for your web part. Or use “Apply” and continue adjustment.
The view of your web part can be changed at any time you want.