Hello pepperstreet
Thanks for your help. It does not require Custom CSS. You got it right. It is indeed a module used in top1 position.
Pio,
Apology for the inconvenience. You can remove or unpublish this module to hide it.
https://prnt.sc/F5COqGM2Pqdk
To remove the header, you can go to Template Options -> Layout Builder -> Predefined Headers and switch to Classic Layout. Even you do not need to unpublish the module, if you do this.
https://prnt.sc/uImhguOL7BlT
Let me know if you need further help.
Best regards