By design, the RadRibbonView follows MS standards (described in design document) for creating an Office 2010 Ribbon-like controls. In these standards there are many constants like RibbonView.Height, Application Button Height, Width, etc. So these sizes are static in XAML, they could be changed by editing the default template but this could lead to various and unpredictable issues. So you may consider changing the RibbonView Height as an unsupported scenario. Thank you for your understanding.
the Telerik team
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