Fantastic.. Worked for me.. I was creating pages, and they were not showing up..
All you have to do is copy the code, paste it in notepad or any editor, and change the word “about”.. To “whatever” page you created. I think there are six instances of name changing.. That’s what I did anyway.. Then I saved it how I wanted.. and adding .php at the end.. and uploaded it to the server, in the mu-plugins.. refreshed my page.. and voila.