Indeed the RibbonWindow will be different on different OS and with different settings being applied. However we support theming for it so that it gets unified look with RadRibbonView by ignoring(overriding) the default OS theming.
For the purpose you'll have to set the IsWindowsThemeEnabled
property of the RibbonWindow to false in a static conctructor as stated in our documentation
and add RadRibbonWindowStyle to the application's global resources.
Let me know how this works for you.
Telerik by Progress
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