How do I change page Titles, Font , Colors, and image size on 2021

This is the blog page – The page –

The title is huge and the wrong colour.
I have tried to do this on the global settings – but it looks like I cannot change it from there.

I have also gone through the article on twentytwentyone – so there is nothing on that page. I usually look for help before asking for help also

Please help – Thank you beforehand also

The page I need help with: [log in to see the link]