How to make the site width fixed on all devices?

Question

css

<meta name="viewport" content="width=1380, initial-scale=1.0">

So that a fixed version opens and nothing floats away.
1. I know this combination so far, is there anything else I can add or improve?
2.B WP where to edit meta tags?....
Thanks

Answer 1

< meta name="viewport" content="width=desired width" /> (remove spaces, here the editor overwrites this code)
I registered such a meta tag, it worked on both android and iphone
in WP in the header.php theme file, before by calling the wp_head() function

Answer 2

In general, delete the viewport and a scaled version will open.