Thank you for contacting us about this issue!
For creating custom list styles or modifying a default one you will need to use the ListStyle class and its Levels property, which gives you access to a collection of ListLevelStyle instances. Through this ListLevelStyle instances you have access to the properties (such as Indent, HangingIndent, FontFamily, ...) for each level in the ListStyle. I suggest you refer to this article for more information on list styles.
You can obtain one of the default list styles in order to modify it as follows:
ListStyle style = Telerik.Windows.Documents.Lists.DefaultListStyles.Bulleted;
I hope this helps! I you have any other questions or concerns please do not hesitate to contact us again!
the Telerik team
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