The DataGrid ScrollBar is covered by the group header when grouping.
looking the attachment.
For example: WinUI sample app that presents some real time dashboard (gauge or chart controls for example) with a Web API backend.
RibbonView is collapsed when set as direct content of Window in WinUI Desktop App.
Workaround is to wrap it inside a Grid:
<Window>
<Grid>
<telerik:RadRibbonView...