By default, every Form you create has automatic navigation buttons in the form of arrows that appear at the top of your Form in the title bar of the app. These buttons let the user advance forward one page or backward by one page at a time. The user can also swipe across the page with their finger to navigate forward and backward. However, for some Forms, this sequential navigation is not desired since the user needs to be able to jump around the Form as they fill it out. For example, if they were performing a house inspection, they might fill out a "bedroom" page, then a "bathroom" page, and then need to fill out another bedroom. This becomes tedious if the user has to keep moving back or forward to find the pages they need to fill out.
The solution is to disable the automatic page navigation and add your own navigation buttons. You add the buttons using the User Action field type available in the Form Designer, which lets you drop buttons onto any Form page.
Buttons Right1 and Right2 were traditionally associated with in-app page navigation, with Right1 used to navigate back one page and Right2 used to navigate forward one page; you now have the option to assign any user action to these buttons.

Let's go through a simple example. We assume you already have an existing Form that has some pages in it. If you don't, create one and add some pages and fields. Make sure you have your Form open in the Form designer before proceeding below.
The above image is an example of what your navigation buttons could look like
Now on each of your Form's pages, you need to add buttons that jump the user back to the "menu" page. To add these buttons, make use of the User Action field type which lets you drop buttons on your form. It's usually best to put these buttons at the bottom of each page, but placement is up to you. On each of these User Action buttons:
Depending on your design, you might also want to add a "Finish" button on each page, which will jump the user to the end of the Form. To do this, simply pick the "End of Form" option under the list of pages to jump to when you set the interaction property on the button. You can also use the "Upload Form" interaction option if you want to skip the end of the Form splash screen completely.
If you don't want the user to be able to complete the Form from every page, then make sure you add a "Finish" button to your menu page.
Remember, all Form navigation is up to you - so make sure there is a way to actually complete and upload the Form!