It seems that this attribute does not work any longer. We will update our documentation. To accomplish this task, you can update the Model via the controller by assigning the Width and Height properties value of the IModelTemplateWin.FormStates["viewID"] model node as it is shown in the following code snippet:
((IModelTemplateWin)Application.Model.Templates[typeof(DevExpress.ExpressApp.Win.Templates.LookupControlTemplate).FullName]).FormStates["YOUR_OBJECT_LookupListView"].Width = "1000";
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