Is it possible to disable the full version of the site using the viewport?

Question

css

There is Bootstrap 3, you need to make it possible to display the full version of the site on mobile and vice versa, in the first case, changing the viewport helps: How to make sure that the mobile version is displayed on the desktop anyway? UPD: this doesn't work:
<meta name="viewport" content="width=1200">
<meta name="viewport" content="width=768">