I've found plenty of documentation about how to adjust view/edit permissions once you have a Plan.
The question is about how users are granted access to any Plans functionality specifically.
We have users who have been operating otherwise fine in Jira and seem to have all other necessary functionality but can't see Plans. It isn't on their navigation and they can't open links to Plans, even after they have been added as a Plan editor!
The closest answer I've found is this one from 2022 that says they need to be added to jira-software-access, but I know a lot has changed since then.
https://community.atlassian.com/forums/Jira-questions/User-Unable-to-See-Plans-Despite-Having-Access/qaq-p/2232623
Edit: removed unnecessary info about specific user groups
Is there another settings/access menu I haven't found?