Thank you for reaching out to the Samsung community! We apologize to inform you that the feature to lock application individually is not available in the device. We have taken your feedback and any update in this regards will be conveyed to you via various means of communication.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
