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You can hide the +/- symbol by collapsing image element in Layout event:
|void radTreeView1_Layout(object sender, LayoutEventArgs e)
| this.radTreeView1.TreeViewElement.Children.Children.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
Unfortunately, there is not a way to remove the node indent and show it at the left edge.
Do not hesitate to contact me again if you have other questions.
the Telerik team
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