How do I restrict entering or selecting multiple component for a component field at the time of issue creating in JIRA for a particular project ?
Thanks
You don't. The component field is multiple select.
You could use another field instead, or if you're willing to code, have another field and then pop the selection into components later. Or try a Behaviour from the ScriptRunner add-on.
JIRA Misc Workflow Extensions, included in JIRA Cloud but not JIRA Server, includes a validator for this purpose – Field has single value validator
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