Hello, Fabian,
Currently, the possible workaround is to adjust the padding of the scrollbar's buttons:
RadRichTextBox editor = this.radRichTextEditor1.RichTextBoxElement.ActiveDocumentEditor as RadRichTextBox;
editor.VerticalScrollBar.FirstButton.Padding = new Padding(-4, 0, 7, 0);
editor.VerticalScrollBar.SecondButton.Padding = new Padding(-4, 0, 7, 0);
Regards,
Nadya
Progress Telerik
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