Use the following code in the project:

    Private Sub btnToggleWW_Click(sender As Object, e As EventArgs) Handles btnToggleWW.Click
        RadSyntaxEditor1.IsWordWrapEnabled = Not RadSyntaxEditor1.IsWordWrapEnabled
        Me.Text = RadSyntaxEditor1.IsWordWrapEnabled.ToString()

    End Sub

When you enable the word wrapping, the horizontal scrollbar is collapsed:

However, when the word wrapping is disabled, the scrollbar doesn't reappear anymore:

XMLFoldingTagger is not documented. Neither here: https://docs.telerik.com/devtools/winforms/controls/syntax-editor/features/taggers/overview nor here: https://docs.telerik.com/devtools/winforms/controls/syntax-editor/features/taggers/folding-taggers.