Ankur Bawiskar
Tera Patron

@arunkulal 

check if this link helps

How to set Global Search to Global scope ONLY after impersonation for a particular user. 

If my response helped please mark it correct and close the thread so that it benefits future readers.

Regards,
Ankur
Certified Technical Architect  ||  10x ServiceNow MVP  ||  ServiceNow Community Leader