Provide an option to set explicit style to the grouping panel, for example expose GroupingPanelStyle property. 

Currently, the option is using an implicit style targeting the DataGridGroupingPanel

<Style TargetType="telerik:DataGridGroupingPanel">
    <Setter Property="BackgroundColor" Value="Red"/>
    <Setter Property="HeaderText" Value="Hello to group"/>
    <Setter Property="CornerRadius" Value="10"/>
    <Setter Property="BorderThickness" Value="2"/>
    <Setter Property="BorderColor" Value="Blue"/>
</Style>

To have a real alternative for wpf, the scheduler should support timeline view. Not for the mobile, but for tablet and browser applications.

In my application i have the resources on the left and de timeline on the top. This is neccesary to migrate to MAUI and be later to Uno or whatsoever