Hello @jragregorio ,
If you are using Jira Datacenter, there is a project archiving function. If you are using Server / Cloud, you can refer to the suggestions in the following posts.
Think before what you are doing !
Some links in the instance will break as this is mentioned in some of the XML files.
If you want to hide the projects there are number of ways,
In Data Center, there is option available to archive projects and also each issue.
In Server, you need to remove all Permissions in the Permission Scheme.
As in Cloud mentioned by @Ollie_Guan Follow the links
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event