You don't. An empty custom field will not be displayed on the issue view.
You can force it by making the field mandatory (and if it's a select type field, allowing an option of " " or something equally empty-looking), but you'll then have the problem that the field will always have data (and hence searches like "is empty" will fail and you'll get inaccurate numbers from reports)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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