To change the appearance of the user interface of the Web Portals, you change the design that is in use. For example, you can use a contrasting theme.
To change the theme of the user interface
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In the header, click
(Profile) > User interface settings.
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In the User Interface Settings dialog, select the theme you want in the Application theme drop-down.
TIP: The Device theme theme takes the theme from your operating system.
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Click Save.