You can use the Group Policy editor (Gpedit.msc) under the following location to configure Start menu features:
User Configuration \ Administrative Templates \ Start Menu and Taskbar
Policy:Force Logoff to the Start Menu
Description:Forces the Logoff button to the Start menu and prevents users from removing the Logoff option from the Start menu.
Registry Value:"ForceStartMenuLogoff"
Enable
Policy

isable Logoff on the Start Menu
Description:Removes the "Logoff" button from the Start menu and prevents users from adding the Logoff button to the Start menu.
Registry Value:"StartMenuLogoff"
Disable
Policy

isable and remove the Turn Off Computer button
Description:Removes the "Turn Off Computer" button from the Start Menu and prevents shutting down Windows using the standard shutdown user interface.
Registry Value:"NoClose"
Disable