Only index.html page is showing in window

Since yesterday, when I go to another page besides the index.html page and run the code, the index.html page still shows in the browsing window. It doesn’t display the new page that I want to see. Can someone please help me with this?
Thank you.

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I will make a new post with just a simple program. I just created 2 simple pages and the same thing happens. I will call it test-3