To change Metronic's font family please follow below quick steps:
<!--begin::Fonts-->
<link rel="stylesheet" href=" />
<!--end::Fonts-->
src/sass/components/_variables.custom.scss
and override the default font family to apply the new font family globally:// Typography
// Font family
$font-family-sans-serif: Poppins, Helvetica, "sans-serif";
Poppins
is the font family name while Helvetica, "sans-serif"
alternative system font familiy names in case the main font name is not available.