cPanel & WHM currently ships with one default cPanel theme but with different variations of the same theme.
A theme applies an overlay on the skeletal framework for all of the cPanel interfaces.
Customers can choose a style to customize their cPanel interface’s appearance.
To change your interface’s style, click Apply for the desired style.
The interface will refresh with the newly-selected style.
To set a style as the default style, click Set as Default for the desired style.
Please note that when you set a style as the default style, the system does not automatically apply that style to your account.
You must also click Apply to apply that style for your account.