Hi Pradeep

1. Navigate to System Definition > Dictionary.
2. Filter the list to find the reference field of which you want to disable the information icon.
3. Open the record (eg. Caller)
4. Add this line to the Attributes: ref_decoration_disabled=true.
5. Save/Update the record.
6. 

If my reply is Helpful/Correct, please mark the answer as Helpful/Correct.

Thanks,

Harish