<treeview:TreeViewDescriptor
			ItemsSourcePath="Children"
			TargetType="{x:Type models:Folder}">
                <treeview:TreeViewDescriptor.ItemTemplate>
                    <DataTemplate>
                        <Grid ColumnDefinitions="Auto, *, Auto">

                            <Label
				Grid.Column="0"
				FontFamily="MaterialIcons"
				FontSize="22.0"
				Text="Folder"
				TextColor="Peru"
				VerticalOptions="Center" />

                            <Label
				Grid.Column="1" 
				Margin="6.0,0.0"
				LineBreakMode="TailTruncation"
				Text="Item with loooooooooooooooong naaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaammmmmmmmmmmmmmeeeeeeeeeeeeee"
				VerticalOptions="Center" />

                            <Button Text=". . ."
				Grid.Column="2"
				BackgroundColor="Transparent"
				WidthRequest="64.0">
                            </Button>
                        </Grid>
                    </DataTemplate>
                </treeview:TreeViewDescriptor.ItemTemplate>
            </treeview:TreeViewDescriptor>

Workaround:

Change the Palette.

ChartPalette chartPalette = new ChartPalette();
chartPalette.Entries.Add(new PaletteEntry { FillColor = Colors.LightBlue, StrokeColor = Colors.LightGreen });
this.chart.Palette = chartPalette;

    Focused += SupporterAutoCompleteSearchBar_Focused;

    private void SupporterAutoCompleteSearchBar_Focused(object sender, FocusEventArgs e)
    {
        ShowSuggestions();
    }

<ContentPage.Resources>
        <ResourceDictionary>
            <Style TargetType="telerik:RadBusyIndicator" x:Name="busy">
                <Setter Property="BackgroundColor" Value="Red"/>
            </Style>
        </ResourceDictionary>
    </ContentPage.Resources>
    <telerik:RadDataGrid IsBusy="True"/>

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="Class"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:models="clr-namespace:NameSpace.Models"
    xmlns:telerik="http://schemas.telerik.com/2022/xaml/maui"
    xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
    xmlns:vm="clr-namespace:NameSpace.ViewModels"
    Title="Demo">
    <ContentPage.BindingContext>
        <vm:NewDemoViewModel />
    </ContentPage.BindingContext>
    <ContentPage.Content>
        <ScrollView>
            <telerik:RadDataForm
                x:Name="dataForm"
                AutoGenerateItems="False"
                BindingContext="{Binding Demo}"
                ValidationMode="LostFocus">
                <telerik:DataFormGroup HeaderText="Text">
                    <telerik:DataFormRadEntryEditor PropertyName="Host" />
                    <telerik:DataFormRadEntryEditor PropertyName="Address" />
                    <telerik:DataFormRadEntryEditor PropertyName="City" />
                    <telerik:DataFormRadEntryEditor PropertyName="PostalCode" />
                    <telerik:DataFormRadEntryEditor PropertyName="PhoneNumber" />
                </telerik:DataFormGroup>
                <telerik:DataFormGroup HeaderText="Text">
                    <telerik:DataFormRadEntryEditor PropertyName="CreatedOn" />
                    <telerik:DataFormRadDatePickerEditor PropertyName="PlannedDate" />
                    <telerik:DataFormRadDatePickerEditor PropertyName="Date" />
                    <telerik:DataFormRadTimePickerEditor PropertyName="Time" />
                    <!--<telerik:DataFormRadCheckBoxEditor PropertyName="PersoDemo" />
                    <telerik:DataFormRadEntryEditor PropertyName="RSVPPage" />-->
                    <!--<telerik:DataFormRadEntryEditor PropertyName="Ambassador" />
                        <telerik:DataFormRadEntryEditor PropertyName="InternalNote" />-->
                </telerik:DataFormGroup>
            </telerik:RadDataForm>
        </ScrollView>
    </ContentPage.Content>
</ContentPage>

<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>