Child theme problems – header and footer missing

Hi @pracowniaotus

Block themes, like Twenty Twenty-Four, do not interact with child themes in the same way as classic themes. With block themes, you can make more use of style variations and template modifications instead of heavy customizations through PHP files.

You can use style variations to add alternate patterns and layouts within the existing theme structure. If you’re set on creating a child theme, you can follow these steps:

• Export your main block theme using the Site Editor’s export feature.
• Open the style.css file of the child theme, and modify the header to point to the parent theme located in your wp-content/themes folder. Note the guidance here about styles.css for Block themes though.
• From there, you can create your own style variations, patterns, and templates.

For more detailed guidance, you can review the following resources:

Creating a Child Theme for a Block Theme

Exporting and Customizing Block Themes

Style variations vs Child themes

Style Variations in the Site Editor

Working with Templates and Pattern

Hope this helps!