There's no way to do this in default JIRA, and I believe this is actually by design. Deleting users can cause potential issues in the database, if I'm not mistaken.
Is your concern that these users are taking up user licenses? Really, as long as a user is set as inactive and isn't in a group that allows Application Access (thereby not using up one of your user licenses), you should be fine.
If your concern is that you have a hard time managing so many users, you should be able to filter down to just active users, or at least filter down to users who have a certain Application Access.
As Alex said, don't delete users. Make them inactive. JIRA is a relational database and in the history there is a pointer to the user, not their name, so you'll get an error displaying it. Therefor you lose historical data about who did and said what.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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