Can I change the highlighting of the found part when searching?

Yes, sure. To do that, you need to override the style:

        <Style TargetType="local:PagePresenter">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="local:PagePresenter">
                        <Grid>
                            <Border Background="White"  BorderBrush="Black" BorderThickness="1">
                                <Canvas  x:Name="pageCanvas">
                                    <Rectangle x:Name="hightlight" Visibility="Collapsed" StrokeThickness="1" >
                                        <Rectangle.Stroke>
                                            <SolidColorBrush Color="#FFFFCB5A"/>
                                        </Rectangle.Stroke>
                                        <Rectangle.Fill>
                                            <SolidColorBrush Color="Yellow" Opacity="0.2"/>
                                        </Rectangle.Fill>
                                    </Rectangle>
                                </Canvas>
                            </Border>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>


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