How do I change the theme setting of EWS?

You can access any page of EWS, at the right-hand corner there will be a setting icon as shown in the image below.

Click on the icon and you will see the following colour palette. You can change the colour setting of the Navbar Background, Sidenav Background and Footer Background. Alternatively, you can also pick a different Theme at the last section of the palette. After selecting the different colours, the EWS theme will reflect the change instantly.