Hello, Simran,
1/ Header Builder > Multiple headers > edit or delete this custom header – https://prnt.sc/zC8a_k8w_6PE
2/ Theme Options > Header Builder > Main menu > Mega Menu Dropdown Full-Width > Off
3/ Please provide a screenshot of the example.
4/ Sorry but your request is unclear. Describe it in more detail, please.
Best Regards, 8Themes Team
