Hello,
Unfortunately the setting has been removed from HikaShop with the new checkout editor.
One solution is to change temporally your HikaShop configuration to use the "checkout legacy" so you'll get the old checkout editor with the "old" settings. Then once you have select the article you want, you can re-switch to the non legacy checkout.
Next HikaMarket version will have the compatibility with the new checkout editor.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.