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Change sub menu position

The submenu position can be changed by using the beforeOpen event. Assign the top and left position where you want to open the submenu to the beforeOpen event arguments args.top and args.left respectively.

In the below sample, the sub menu opens above the parent menu item.

Source
Preview
app.ts
index.html
import { Menu, MenuItemModel, MenuModel } from '@syncfusion/ej2-navigations';
import { BeforeOpenCloseMenuEventArgs } from '@syncfusion/ej2-navigations';
import { enableRipple, closest } from '@syncfusion/ej2-base';

enableRipple(true);

// Menu items definition
let menuItems: MenuItemModel[] = [
    {
        text: 'File',
        items: [
            { text: 'Open' },
            { text: 'Save' },
            { text: 'Exit' }
        ]
    },
    {
        text: 'Edit',
        items: [
            { text: 'Cut' },
            { text: 'Copy' },
            { text: 'Paste' }
        ]
    },
    {
        text: 'View',
        items: [
            { text: 'Toolbar' },
            { text: 'Sidebar' }
        ]
    },
    {
        text: 'Tools',
        items: [
            { text: 'Spelling & Grammar' },
            { text: 'Customize' },
            { text: 'Options' }
        ]
    },
    { text: 'Go' },
    { text: 'Help' }
];

// Menu model definitions
let menuOptions: MenuModel = {
    items: menuItems,
    beforeOpen: (args: BeforeOpenCloseMenuEventArgs) => {
        // Getting parent menu item element offset
        let relativeOffset: ClientRect = closest(args.event.target as Element, '.e-menu-item').getBoundingClientRect();
        // Getting sub menu wrapper element using closest method
        let subMenuEle: HTMLElement = closest(args.element, '.e-menu-wrapper') as HTMLElement;
        subMenuEle.style.display = 'block';
        args.top = (relativeOffset.top - subMenuEle.getBoundingClientRect().height) + pageYOffset;
        args.left = relativeOffset.left + pageXOffset;
        subMenuEle.style.display = '';
    }
};

// Initialize Menu component
new Menu(menuOptions, '#menu');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Essential JS 2</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" />
    <meta name="description" content="Essential JS 2" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />

    <!--style reference from app-->
    <link href="styles.css" rel="stylesheet" />

    <!--system js reference and configuration-->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
</head>
<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div class="control-section">
            <ul id="menu"></ul>
        </div>
    </div>
</body>

</html>

For custom positioning, set both top and left position in the beforeOpen event.