Banking – What are the reasons for not giving Menu options in Transfer flow

In Banking -

Is it a good idea to give menu option during the transaction (Money transfer) flow? etc..

If yes - My concern is that user may feel that transaction data would be stored and may feel in-secured to exit in-between if he wants to exit. Assume we provide alert to the user to be sure to exit the transaction, but i dont feel good to take the alert approach.

What are the ux reasons for both positive and negative scenarios