In the price options and fields settings, specify the price = 0. That will hide the prices from invoice elements.
To hide Total and Deposit, go to the widget settings on the Design panel. Set the Custom CSS style checkbox and insert this CSS:
.order-totals { display:none; }
.reservation-invoice__total-label { display:none; }
.reservation-invoice__total-amount { display:none; }
As a result, all prices will be hidden from reservation and cart screens: