How to password protect your Google Docs

It work pretty well for me but i i always delete my pdf to create a new one... i don't know if i should do it like this.
Thanks very much !!!!!!

In short, to protect one file, you give access to all your Google drive files to a third party app! 😅

Does not work. There is no add-on that pops up called Password Protect for Google Docs.

Error 0 occurred while receiving the file.

Did not work for me. It shows a popup and then says log in again and then gives an error...