Column Width

The [ObservableObject], [ObservableProperty] and [RelayCommand] attributes come from the CommunityToolkit.Mvvm package, you can read more about it here.

This web site wraps every sample using a UserControl instance, but LiveCharts controls can be used inside any container.

sample image

View model

using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Bars.Spacing;

public partial class ViewModel : ObservableObject
{
    public ISeries[] Series { get; set; } =
    {
        new ColumnSeries<double>
        {
            Values = new ObservableCollection<double> { 20, 50, 40, 20, 40, 30, 50, 20, 50, 40 },

            // Defines the distance between every bars in the series
            Padding = 0,

            // Defines the max width a bar can have
            MaxBarWidth = double.PositiveInfinity
        }
    };
}

XAML

<UserControl x:Class="AvaloniaSample.Bars.Spacing.View"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:lvc="using:LiveChartsCore.SkiaSharpView.Avalonia"
             xmlns:vms="using:ViewModelsSamples.Bars.Spacing">
  <UserControl.DataContext>
    <vms:ViewModel/>
  </UserControl.DataContext>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>

    <lvc:CartesianChart Series="{Binding Series}"></lvc:CartesianChart>
  </Grid>
</UserControl>

Articles you might also find useful:

Cartesian chart control
Column series properties