When I look through the mobile device, everything is very small, the navigation does not collapse. I see what shows as for the tablet, even if the screen is less than 767px.
Can I check it directly from Chrome in mobile mode?
I do not understand what the error is, where is the bug?

    1 answer 1

    It turned out, everything is simple:

    <meta name="viewport" content="width=device-width, initial-scale=1">