To make the additional field columns visible, simply check the column name in the dropdown right next to the Add Record button.
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Note: the additional field options will only be displayed in the dropdown if any of the records have data in the additional field.
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Note: the additional field option will only be displayed in the dropdown if any of the records have data in said field. i.e.: if you have an additional field configured for Supplies named `Warehouse`, the option for `Warehouse` in the dropdown menu will only show up if at least one record have data in the `Warehouse` field.