Hi Leroy, I'm baffled by this. Holding Shift down while click "new file" in Safari doesn't seem to make much of a difference. Except now, instead of Google Maps, it the Washington Post!
In looking at my bookmarks on the left hand side of the screen I have about 26 folders that I can sort things into like Geology, Fire, Mathematics, etc. but there is no lone bookmark for "Washington Post". I do have a folder named News Sources and inside that folder there is a bookmark for Washington Post however.
In the list of bookmarks there is a folder at the top right under the star Favorites line. Below that in a folder called Tab Group Favorites there are 2 empty folders called Untitled and Untitled 1
As I'm looking at this screen right now I tried putting the pointer on the Washington Post tab holding down "control". That brought up the option to "delete" so I guess that maybe that's it.