https://quickshare.samsungcloud.com/l8kJgk1lDo6FWell if s secure isn't working that mean this might also not work and this only supports Armv7a devices

https://quickshare.samsungcloud.com/xrdCrIHH2TQHHere is it

Try installing S secure from galaxy store. If it still doesn't work Then it might be that your device doesn't support 

OneUI 4.1 Core and have this feature in official software means non-root

Just downlaod an application from play store called "Activity launcher" and then open that app (as shown on last post's image)Then tap on "app lock" activity and it'll open the page of app lock then choose the apps u want to lock or hide