ListBox in WPF app is not updating when removing from bound ObservableCollection

Question

I have googled so much on this topic that my hands are bleeding before writing this question. What I have gathered so far is that I know I have to use an ObservableCollection.

The ListBox populates on startup, but the problem occurs when I want to delete/remove an item from the ObservableCollection and have it reflected in the ListBox.

The item is removed from the ObservableCollection but the ListBox does not update anything. I have tried different bindings like Mode and UpdateSourceTrigger.

This is my code so far:

<ListBox Name="projectsListBox" ItemsSource="{Binding Projects}"
<ListBox.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Horizontal" Margin="0,0,5,0">
            <Image Source="{Binding Icon}" Width="20"/>
            <TextBlock Text="{Binding ProjectName}" FontSize="14"/>
        </StackPanel>
    </DataTemplate>
</ListBox.ItemTemplate>
</ListBox>

ViewModel. The ViewModel inherits from ViewModelBase which in turn inherits from INotifyPropertyChanged.

public class OpenProjectViewModel : ViewModelBase
{
    private ObservableCollection<ProjectData> _projects;

    public ObservableCollection<ProjectData> Projects
    {
        get { return _projects; }
        set
        {
            if (_projects != value)
            {
                _projects = value;
                OnPropertyChanged(nameof(Projects));
            }
        }
    }
}

Code that removes the item from the ObservebleCollection:

Projects
    .Remove(Projects
    .Where(_ => _.Id == id).Single());

Update: one thing to note is in OpenProjectView I have a OnDelete_Click button, I have instantiated the OpenProjectViewModel which holds the delete logic for the ObservableCollection. The ObservableCollection is instantiated in the constructor. Any thoughts on how to get around this?

private void OnDelete_Click(object sender, RoutedEventArgs e)
{
    OpenProjectViewModel openProjectViewModel = new();//<--The ObservableCollection is instantiated in the constructor
    openProjectViewModel.DeleteProject(listItem);
}

Did I forget to share anything?

Thank you for your assistance!