It was just an intentional choice by the theme’s designer. In short, they liked it that way, and so do many of the folks using this theme.

If you don’t like it, it can be adjusted via CSS, a plugin like https://wordpress.org/plugins/options-for-twenty-twenty-one/ , or you could just choose a different theme: https://wordpress.org/themes/

Also, I’ve removed your horribly insulting comment and ask you to please not do that again. Your account has been flagged, meaning your posts here will need to be approved by moderators before they become publicly visible. If you have any questions, you can reach the Moderators in the #forums channel on our Slack instance: https://make.wordpress.org/chat/