I am dealing with a plugin, not with a theme, but what I want is to include this meta in the head section.
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1">
I browsed this link, but this link is also not helpful.
I believe it is doable through hooks and filter somehow.
w/o this meta tag the content is shrinking, including fonts getting minimized.