Hello,
The Theme has its own Header Builder which you can find under the Dashboard > WoodMart > Header Builder. In the Header Builder, you can have multiple Header layouts created.
Now, if you want to select a Global Header layout then you can go to Dashboard > Theme Settings > General > Layout > Header > there you can select the Global Header for your Site: https://i.snipboard.io/MET8NW.jpg
But if you want to select a specific Header for a Page then you can edit that Gutenberg editor > there under that you will find the Page Settings options > in where you can select a specific Header for that Page: https://i.snipboard.io/uCh38s.jpg
For the Footer right now, there isn’t a specific Option available. It works globally and it can be made with 2 Types either with Widget or HTML Block and can be set under the Dashboard > Theme Settings > Footer > Footer Content: https://i.snipboard.io/qP5GXW.jpg
You can read about it more here:
https://xtemos.com/docs-topic/woodmart-header-builder/
https://xtemos.com/docs-topic/set-up-footer/
Best Regards