You don't. There's no way to change the type of a field.
You will need to add a new field of the right type, copy over any data you want to keep, and then delete the old field.
@Nic Brough -Adaptavist- If you delete the old field, I'm guessing that will delete the info from all the issues that had the field right?
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Correct,
if you delete the field (the header information saying "this field is here"), then the issue data has nowhere to exist, and hence simply gets deleted.
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@Nic Brough -Adaptavist- Ah, that's what I suspected. Do you know by chance if there's a feature request open to add the ability to change the field type? Thank you!
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There was, but the ones I've seen are all closed with "won't fix" type resolutions
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Ah ok, hopefully we'll be able to change the field type in the future. Thank you for your help!
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