Remove Or Hide Sign in As Different User Option from Share Point 2/2

Step 1 : Alternate solution is copy welcome.ascx control and move to Create Custom Control folder and move that welcome.ascx control .

Step 2 : Remove Sign in as different user menu item.

Step 3 : Change Master Page through Share Point Designer

<%@ Register TagPrefix="wssuc" Tagname="Welcome" src="_controltemplates/Welcome.ascx" %>

and change to your Custom Welcome User control

<%@ Register TagPrefix="wssuc" Tagname="Welcome" src="_controltemplates/CustomUserControl /Welcome.ascx" %>

Step 4 : Save master page.