public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();

        this.chart.HandlerChanged += this.Chart_HandlerChanged;
    }

    private void Chart_HandlerChanged(object sender, EventArgs e)
    {
        this.UpdateChart();
    }

    private void UpdateChart()
    {
        var platformView = this.chart.Handler.PlatformView;
#if IOS || MACCATALYST
        var platformChart = (Telerik.Maui.Controls.Compatibility.ChartRenderer.iOS.TKExtendedChart)platformView;
platformChart.YAxis.Style.LineHidden = false;
#endif
    }
}