H1 does not change when I try to modify it

I have installed the Sydney Pro theme, but when I try to customize the H1 tag, nothing happens - the font size doesn’t change. How do I fix this?

Hello @ythhj,

Can you please please provide a link to your website and describe what exactly you want to achieve?

By the way, please post your future questions in Sydney Pro forum if you are using Sydney Pro theme.

Kind Regards, Roman.