These docs are for an old release. Info on upgrading to v4
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Enables/disables use of jQuery UI theming.

This setting has been deprecated. To use jQuery UI theming, set the themeSystem setting to 'jquery-ui' instead.

Boolean, default: false

Once you enable theming with true, you still need to include the CSS file for the theme you want. For example, if you just downloaded a theme from the jQuery UI Themeroller, you need to put a <link> tag in your page’s <head>.