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We have checked the reported issue in our end. This issue may occur due to enablePersistence property set to true in your sample and this maintains the previous height of DropDownList popup from browser cache. We suggest you check this in “Incognito window” and confirm it. You can also clear cache in your end, so that the sample will be rendered with the popupHeight, set in sample during initial rendering. We have used the below code in our sample.
@Html.EJ().DropDownList("MenuItemsList").EnableFilterSearch(true).Datasource((List<Data>)ViewBag.RecipeDropdown).DropDownListFields(df => df.ID("MenuItemID").Text("Name").Value("MenuItemID")).WatermarkText("Select a Menu Item").Width("100%").EnablePersistence(true).PopupHeight("600px")
We have attached the sample for your reference, please find the sample at the following link:
DropDownList is rendered as shown below
Please check this sample in your end and let us know if you need further assistance.