Support Global Pre-request-script
Hi and welcome to the community
If you are interested in one pre-script before whole collection you can add it to the Collection itself. Choose Edit collection and go to pre-script tab.
If there is a pack of request in a folder, you can add pre-script to that folder too
One reminder use some tags/ markings in name of that folder that it contains additional config… It is easier to find and edit after long time