Thanks for your response.

We are trying to customise our header design on bbbseed.com
Last month, while working on the same, when we tried to implement the code on the child theme header, it made the website crash. And prior to this, we had tried to implement the code on the main websiteas well, which had resulted in the main website crashing.

So now, we are trying to achieve the same using hoos via the snippets.
We took reference from your article : https://kriesi.at/documentation/enfold/hooks-and-filters/

Are we going in the right direction?
Or shall I share the code that we were trying to implement for customisation? Will that be of any help to identify the issue?