Currently ONEWEB do not have the feature to create Menu for Web Pages. But there is built in template to build menu on Mobile Application.
For Mobile Application, menu is configured as a separate page. Use the Drawer page type to create the menu page and then link the other pages to each menu item.
Go to Mobile App.
Click on Create New Page icon
Enter the page name and choose "Drawer" as page type. Click Start Design
System automatically create a sample menu page.
User can customize the menu according to their requirements.
Users can also add more features such as default page to the menu at the Splitter element level