Hi @gabiq,

Please navigate to Dashboard > Forums > Settings > Styles admin page, put  the following CSS code in the "Custom CSS Code" textarea:

#wpforo #wpforo-wrap * {
font-family: Merriweather, Arial, serif;
}
.fa, .far, .fas {
font-family: "Font Awesome 5 Free" !important;
}
.fab {
font-family: "Font Awesome 5 Brands" !important;
}

Please don't forget to delete all caches and press CTRL+F5(twice) on the frontend before checking.

Hi @gabiq,

You've damaged the whole forum font by adding 5.5px letter space using Elementor. Please remove this attribute.

If you can't find and can't remove it, you should letter-spacing:0px to all elements of wpForo forum. Put this CSS code in the Custom CSS code textarea in Dashboard > Forums > Settings > Styles admin page. Save it, delete all caches, navigate to forum front-end and press Ctrl+F5 to reset browser cache:

#wpforo #wpforo-wrap * {
     letter-spacing: 0px;
}