1-Provide Pin/pattern/password option upon hide/unhide and recyclebin button or a private vault option in Gallery and my files app.(Many apps and companies are providing it inbuilt,so knox should not be the excuse)
2-Give an option wheather a user wants to put some photos/videos or entire folder into private vault.
3-Make S secure an inbuilt app .
4-Provide an option to keep a wallpaper on S secure lock screen.
5-Provide an option for intruder selfie.
6-Option to block messges which are coming without any number.
7-Remove hiya service.It mainly detectimg numbers coming from a samsung phone.Instead use a truecaller type service.