There is a hack to core code that changes the front-end from many select to one, but it's not supported, and needs a little code and a restart.
Most people use a single-select custom field instead, and re-use components to do something else (or hide it)
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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