Hello,
1), 2) Be careful while adding the custom code. Problem was caused by unclosed div tag https://prnt.sc/x876sc
3) Keep this option disabled https://prnt.sc/x87b5p
4) We don’t have HTML block 4 element for the header builder. Use widget area https://prnt.sc/x87ufk to add more custom code to widget https://prnt.sc/x87j4d
Regards
