update layout

how to change the displayed layout after clicking the menu item2 ?

I want to change the view from MainLayout to MainLayout2.

menudelegate.mc

import Toybox.Lang;
import Toybox.System;
import Toybox.WatchUi;

class test2MenuDelegate extends WatchUi.MenuInputDelegate {

    function initialize() {
        MenuInputDelegate.initialize();
}
    function onMenuItem(item as Symbol) as Void {
        if (item == :item_1) {
            System.println("item 1");
        } else if (item == :item_2) {
            System.println("item 2");
 


        }
    }

}

layout.xml

<resources>
<layout id="MainLayout">
    <label x="center" y="5" text="@Strings.prompt" color="Graphics.COLOR_WHITE" justification="Graphics.TEXT_JUSTIFY_CENTER" />
    <bitmap id="id_monkey" x="center" y="30" filename="../drawables/1.svg" />
</layout>
<layout id="MainLayout2">
    <label x="center" y="5" text="@Strings.prompt" color="Graphics.COLOR_WHITE" justification="Graphics.TEXT_JUSTIFY_CENTER" />
    
</layout>
</resources>