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Go to Project Settings > Chat Settings > Widget Functionality Features > Pre-Chat Form.
Select from the available fields, or create new supported custom fields.
If you create new custom fields, make sure you’ve added them to the correct screens, or they won’t appear.
Find the newly created field in the list of available, and click the ➕ icon to add it to your Pre-Chat form.
Adjust the name of the custom field according to your liking. You can also reorder fields and specify if they are mandatory or optional.
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Click Save.