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My website URL has a www in front of it, and when i make the one without www default, it does not load up

i had the option to use either or as my domain name. I want to show in my address bar when my site loads up. but instead it shows

Now if i go back to my hosting and i make default or i unpublish from then publish, My site fails to load up. says page not found!

my domain name was gotten from name cheap and i have set all web flow asked me to set.

Take a look at this article