You can change the default Height of the RadRibbonView by editing its ControlTemplate. However, based on our customers feedback, we have also logged a feature request in our PITS to implement a feature for changing the Height of the control out-of-the-box.
You can vote for the feature to increase its priority, and in the meantime, when you edit the RibbonViewControlTemplate, you'll need to customize the SelectedTabContent control element Height settings.
I attached a sample project to get you started.
Regards,
Tina Stancheva
the Telerik team
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