@appotry welcome to the forum.
This is a comment made by Laurent (the project owner) during beta testing in reply to a similar question.
Note sharing worked. Any selected note, when shared, can be viewed as a web page. I appreciate this is very new and being developed but notes are currently shared without access control.
I don't expect this to ever be any different. I feel supporting a password wouldn't make sense because the password is the share key (the URL ID). I guess if someone requires extra security they can always send a part of the URL via one channel and the second part via another one. Share keys are a 32 characters nano-id, and it would apparently take "more than 1 quadrillion years needed, in order to have a 1% probability of at least one collision", so that sounds secure enough.