Hi there,
you page content is built with a page builder which has its own padding.
If you want to add the extra padding to the Entry Title you can either:
1. Disable the Content Title in the WP Editor and add that the H1 title to your Pagebuilder content:
https://docs.generatepress.com/article/disable-elements-overview/
OR
2. Add some padding to the themes entry header with some CSS:
.page .entry-header {
padding-left: 20px;
padding-right: 20px;
}