The item list on a picking list typically shows the item name, quantity and unit, but it is possible to enable a column for the product number.
In the client profile in BxAdmin, you can easily add a parameter to increase the column width for the product number from 0 to another value. You can also choose to remove the product name if you only want to display the product number by setting the column width to 0.
The width is relative, and the default width for the product name is set to 60. If you want to replace the product name with the product number, you can add two fields.
The Area should be: pickinglist, and the property should be either ProductnoColumnWidth and/or ProductnameColumnWidth.
You can also choose the configuration here and paste it directly into BxAdmin.
This example will replace the product name with the product number:
[{"routine":"pickinglist","name":"ProductnoColumnWidth","value":"60"},
{"routine":"pickinglist","name":"ProductnameColumnWidth","value":"0"}]