Thank you for reaching out to the Samsung community! We would like to inform that you can disable the application to install app from unknown source. Please follow the below step:
- Navigate to settings>>Apps>>3 dot>>Special access>>Install app from unknown source>>Apps>>Disable.
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#/
