One workaround is to remove nodes that are not visible, e.g., in the Page_Load event:

RadNavigation1.Nodes.RemoveAll(x => !x.Visible);

Another workaround is to remove the HTML of hidden nodes. Note that this will not affect the nodes collections and they will still be present. Invoking operations or methods on such removed nodes can cause errors.

			<telerik:RadNavigation runat="server" ID="RadNavigation1" OnClientLoad="OnClientLoad">
				<Nodes>
					<telerik:NavigationNode Text="first"></telerik:NavigationNode>
					<telerik:NavigationNode Text="second" Visible="false"></telerik:NavigationNode>
					<telerik:NavigationNode Text="third"></telerik:NavigationNode>
				</Nodes>
			</telerik:RadNavigation>
			<script>
				function OnClientLoad(sender, args) {
					var nodes = sender.get_allNodes();
					var indicesToRemove = [];
					for (var i = 0; i < nodes.length; i++) {
						if (nodes[i].get_element().style.display == "none") {
							$telerik.$(nodes[i].get_element()).remove();
						}
					}
				}
			</script>

Please add screenboundary detection for expandable menu items.

When there is not enough space for menu items to expand on the right side, expand them to the left side and vice-versa.

See attached screenshot for more information