Files and folders protected by File Share Encryption should show a padlock overlay in Windows File Explorer:
Sometimes the padlock overlay icon is missing or it is shown intermittently.
This issue may occur only on network shares. You can confirm this by creating a protected folder on a local drive and checking that the issue still occurs.
Symantec File Share Encryption 10.5 and above.
Check if the file/folder is actually encrypted by doing the following:
Right click on PGP Tray from the notifications area of the taskbar and choose Options or open Encryption Desktop and choose Tools / Options from the menu. Check in the File Share tab that the Overlay PGP icon on secured files and folders option is enabled:
From Windows File Explorer, navigate in and out of the protected folder or simply try waiting a few minutes.
Ensure that you are running the latest version of Symantec File Share Encryption.