Hi,
Please update the plugin to the latest v4.1.2. After that, please go to “WooCommerce > Settings > EAN > Print” and there, in the “Admin Options > Print buttons” section, locate the new “Quantity input” option – add “Products > Bulk actions” to it. Now you should be able to set quantity when printing from the products list.
Please give it a try and let me know what you think.
P.S. If you like the plugin, please consider leaving me a rating here or here, I would really appreciate it.