http://www.bleepingcomputer.com/tutorials/disable-fast-user-switching-in-windows/
source - http://superuser.com/a/833976
W+R > gpedit.msc
Local Computer Policy/Computer Configuration/Administrative Templates/System/Logon > the Hide Entry Points for Fast User Switching should be enabled, by default is Not Configured
Or you can disable it this way through the registry.
1. Type regedit in RUN or Startmenu Searchbox and press Enter. It'll open Registry Editor.
2. Now go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
3. In right-side pane, create a new DWORD value HideFastUserSwitching and set its value to 1
4. That's it. Now "Switch User" option will be disabled from Welcome screen as well as from Shutdown menu.
source - https://social.technet.microsoft.com/Forums/windows/en-US/2bb6ae34-c764-469f-8eb5-06f20a17ffd4/disabling-switch-user-log-off-and-lock-from-shut-down-button
allow only one user
#FastUserSwitching #fastswitch
source - http://superuser.com/a/833976
W+R > gpedit.msc
Local Computer Policy/Computer Configuration/Administrative Templates/System/Logon > the Hide Entry Points for Fast User Switching should be enabled, by default is Not Configured
Or you can disable it this way through the registry.
1. Type regedit in RUN or Startmenu Searchbox and press Enter. It'll open Registry Editor.
2. Now go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
3. In right-side pane, create a new DWORD value HideFastUserSwitching and set its value to 1
4. That's it. Now "Switch User" option will be disabled from Welcome screen as well as from Shutdown menu.
source - https://social.technet.microsoft.com/Forums/windows/en-US/2bb6ae34-c764-469f-8eb5-06f20a17ffd4/disabling-switch-user-log-off-and-lock-from-shut-down-button
allow only one user
#FastUserSwitching #fastswitch