I have a closed ticket that is not letting me edit the security level to view all. The edit button is missing and I am an admin.
What I found after trying your steps is that I had to reopen the issue, edit the security level and then resolve it again. This fixed it.
The Closed status might have a property that forbids editing the issue.
After following these steps, you should be able to edit the issue.
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Do you match the rules for the security level you want to set it to, and do you have "edit issues" and "set security" permission? (Note that admin means admin, not "can do all sorts of non-admin things", as that's a terrible access model and one JIRA sensibly avoids)
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