Problem modifying the website

I’m having trouble changing the header.
It can’t be the plugins, as I only have the ones recommended in the installation configuration, so the site is basically blank.

I’m using the accessories template and the header doesn’t change. If I try to move things between the lines, nothing happens live. I’ve also checked a few other pages and set them as default to see if they change, but to no avail.

I’m not using cache plugins and I’ve cleared my browser and server cache and still nothing happens.

Assuming it’s WordPress, check the theme compatibility if it’s supported with WordPress 6+

Yes, it only shows updates when I click on a product, but the main page doesn’t change