Determine source of js files in header (Journal)

Hi. I want to modify header.twig in opencart 3x. I went to :

catalog/view/theme/journal2/common/header.twig


and modified the script to defer the js

but it doesn't work. I cleared the cache and all. I also put a comment above to know if it is being picked up and it is picked up but script did not contain defer attribute after change.

I also tried this:

{% for script in scripts %}
<script src= ....... syntax
{% endfor %}


but it didn't work. I really want to know from where all the different JS in the header is coming. Its reducing pagespeed score.

Ask Journal.