You can't do it natively - the whole point of the issue type is to allow people to choose a type.
There's a set of dodgy hacks at https://answers.atlassian.com/questions/179076 (I can never recommend the use of javascript on a JIRA front end, it's almost always a disaster)
Hi Jen,
You can Create custom Issue Type Scheme for your Project and add only one issue type to this scheme. Probably you will need to add one sub-task as well.
Taha
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