Are the issues afterwards still search and accessible?

[kid]

This question is in reference to Atlassian Documentation: Releasing a Version (Kanban)

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[Nic Brough -Adaptavist- · Accepted solution]

Yes.  Releasing them simply fills in a field (and that field is excluded by the Kanban board).  The issues are all still there, and fully searchable.  (Unless you set up something to hide them with issue security!)

[Tarun Sapra]

Once you release an issue, you just have added the "fixVersion" to it, now in order to search them you can write a JQL and use the fixVersion value to search for the released issues.