Hello,
Thank you for reaching out to us.
If you are using the WPBakery plugin then the corresponding builders are available through the theme options, for example, Theme Options > Header builder, and the footer can be created using static blocks with WPBakery https://youtu.be/gY-x4m47Duo?si=RItJMKGqWvFN_LWr
Warm Regards,
The 8Theme Team