Keep Line Item Grid in 23D Open?

Summary:

How to make line item grid hierarchy expanded by default (as before).

Content (please ensure you mask any confidential information):

Hi, In our system we have the model line hidden using CSS. So I was exploring a way to use javascript to keep the line item grid hierarchy expanded. The code snippet below works when I use it in Devtools console, but when I have it in the javascript file it doesn't seem to be working. Is there something I am missing?

Version (include the version you are using, if applicable):

23D

Code Snippet (add any code snippets that support your topic, if applicable):