property PropertiesList.AutoIndent as Boolean
Specifies a value that indicates whether child items are automatically indented.

TypeDescription
Boolean A boolean expression that indicates whether the control automatically indents the child items relative to the position of their parent items. 
By default, the AutoIndent property is True. Use the Indent property to specify the amount, in pixels, that child items are indented relative to their parent items. Use the HasLines property to hide the lines between parent and child items. Use HasGridLines property to draw lines between items.

Use the AutoIndent property to display all +/- signs on the first column without indentation like in the following sample.

AutoIndent = True

AutoIndent = False