Disable Public View of Quotes and Invoices (Personal Data Security)

Invoiceplane Version 1.4.3

How can i disable the public view of Quotes and Invoices?
At the same time how can i prevent public access of any my clients data?

This is due to my clients are all direct consumers so all the data are their personal data which should not be available to the public.

For now, i simply deleted the following folders to prevent viewing of the quotes or invoices