Hello,
When you go to Theme Options > Header builder > content comes from the Default header, so there is no “Edit button” https://prnt.sc/wmcnuu because the Default header can be edited from start and it is applied for all pages automatically.
This header https://prnt.sc/wmcoun is a custom one, click on edit and select on which pages it will be displayed. Also, watch this video – https://youtu.be/BpeXfzNwkOc
Regards