Board Thread:Support Requests - Designing Your Wiki/@comment-34143498-20200714010014/@comment-26611127-20200714043854

Are you referring to article headings or individual tab labels?

Assuming you mean individual tab labels, you can use CSS to change their fonts:

Regarding general wiki-text, you can use inline declarations with the  to change their fonts. Looking at the article you linked, it's evident you already have this knowledge.

However, many of the fonts on the website you linked are not default fonts available on Fandom. If you want a custom font on your wiki, you can import it via CSS (Help:How to import Google Fonts). If you have a font file that you want to upload onto your wiki (most likely .TTF), you can to enable TTF file support.