cant finding lock and mask apps on my device i.e samsung A7

[Darbari]

Hello team! Hope you are doing good , i  need your little help i.e my device have no option for lock and mask apps and i search it also but not found in device  also not included in lock screen option kindly tell and explain my problem thank you!

[shafiq28]

samsung ny applock ko block kia hwa pakistan m