1. Go to Admin > General details > scroll to the section Payment options.
2. Untick the options for guests to see and use the PayPal payment option.
3. In the section Paypal, delete all entries from the fields.
4. Click Save.
Please note:
If the fields in the PayPal section are not cleared, auto-emails will still provide the link for the customers to use to pay by PayPal. Even when the option is not available in the booking cart.