I am using Web Designer 15.0.0.52427 DL Dec 14 2017.
I have been using it for one specific website. Recently, I decided to switch another website for which I had been using MS SharePoint Design 2007 to WebDesign. When I went to publish it, I obviously had to enter a different Username and Password (and final URL). However, a few days later I went back to the first webpage file to update it and when I went to publish it, the user name and password (etc) were from the second website.
Really, this information is not stored in the file, but becomes part of the program? Am I missing some obscure setting somewhere?

David