Enable Offline Folders tab in Windows Explorer

Change the below registry setting as required:

To enable the tab:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\NetCache]
"NoConfigCache"=dword:00000000

To disable the tab:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\NetCache]
"NoConfigCache"=dword:00000001