Tips & Tricks - Galaxy S5 - How to hide personal files
In Settings you’ll find a Private Mode option which allows you to hide personal content. You can choose photos, videos, music, voice recordings, and other files. Now those files can only be accessed by your finger, so there’s no danger of prying eyes stumbling upon them. You can turn Private Mode on and off by dragging two fingers down from the notification bar to open the Quick settings menu. When it’s off the files you chose will not appear anywhere.