When we close a journal to disallow new submissions but still make previous content available, I take the following steps.
In the Journal Management pages:
Setup 4.1: Turn off the ability for Authors to self register. I usually make this selection for reviewers as well.
Journal Sections: For each journal section, turn off the ability for authors to submit. I do this by choosing the option "items can only be submitted by Editors and Section Editors."
You can also take the additional step of unenrollling everyone who has the role of author, but that's not entirely necessary if you complete the step above.
Then I usually insert text in the home page that the journal is no longer accepting submissions, which can be done in step 5 of the Setup pages, as well as editing the Author Guidelines to indicate no submissions are being accepted.
Electronic Publications Manager
Office of Scholarly Communication and Publishing
University Library System, University of Pittsburghvgabler@pitt.edu