Hi I am using data grid horizontaliy, When I have too much data the columns automatically shrinks, how can I prevent that?

Also Is the a way to make columns unclickable,

and horizontal way of highlight alternate records?

here is my code

using Infragistics.Windows.DataPresenter;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Data;

namespace XamDataGrid_AddColumn
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        TempVM ViewModel = new TempVM();
        void xamDataGrid_FieldLayoutInitialized(object sender, Infragistics.Windows.DataPresenter.Events.FieldLayoutInitializedEventArgs e)
        {
            List<ISimulatedValue> container = this.ViewModel.Columns;

            e.FieldLayout.Fields.Add(new Field
            {
                Name = "Name",
                Label = "Index",
                AllowEdit = false,
                Height = new FieldLength(200),
                Width = new FieldLength(20)
            });

            int size = 0;

            //  Find the longest array.
            foreach (ISimulatedValue sim in container)
            {
                size = Math.Max(size, sim.AllValues.Length);
            }
            //  Create a field for each value in the longest array.
            for (int i = 0; i < size; i++)
            {
                var field = new NumericField
                {
                    Label = i,
                    AlternateBinding = new Binding(String.Format("{0}[{1}]", nameof(ISimulatedValue.AllValues), i)),
                    AllowEdit = false,
                    Height = new FieldLength(200)
                    //Format = "P2"
                };

                field.Settings.EditAsType = typeof(String);
                e.FieldLayout.Fields.Add(field);
            }
        }

    }

    public class TempVM
    {
        public TempVM()
        {
            Columns = new List<ISimulatedValue>();
            Columns.Add(new Values("New Name", 100));
            Columns.Add(new Values("New Name2", -100));
        }

        public List<ISimulatedValue> Columns { get; set; }
    }

    public class Values : ISimulatedValue
    {
        public Values(string name, int ratio)
        {
            Name = name;

            //  Generate the sample array data.
            List<double> list = new List<double>();

            for (int i = 0; i < 100; ++i)
            {
                list.Add(ratio * i);
            }
            AllValues = list.ToArray<double>();
        }

        public string Name { get; set; }
        public double[] AllValues { get; set; }
    }

    public interface ISimulatedValue
    {
        string Name { get; set; }
        double[] AllValues { get; set; }
    }
}

<Window x:Class="Slb.WesternGeco.RockPhysics.Simulation.Views.SpreadsheetView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Slb.WesternGeco.RockPhysics.Simulation.Views"
             mc:Ignorable="d" 
        xmlns:igDP="http://infragistics.com/DataPresenter" 
        xmlns:igEditors="http://infragistics.com/Editors"
 
             >
    <Grid>
        <igDP:XamDataGrid  DataSource="{Binding Path=Data}" GroupByAreaLocation="None" 
                            FieldLayoutInitialized="xamDataGrid_FieldLayoutInitialized">
            <igDP:XamDataGrid.ViewSettings>
                <igDP:GridViewSettings Orientation="Horizontal"></igDP:GridViewSettings>
            </igDP:XamDataGrid.ViewSettings>
            <igDP:XamDataGrid.FieldLayoutSettings>
                <igDP:FieldLayoutSettings AutoGenerateFields="False"
                                        AutoFitMode="Always" 
                                        AllowAddNew="False"
                                        HighlightAlternateRecords ="True"/>
            </igDP:XamDataGrid.FieldLayoutSettings>
            </igDP:XamDataGrid>
    </Grid>
</Window>