How to make a page invisible to other but the developer which run the app?

Hi, because I can’t run multiple streamlit apps in different ports. (I have tried set another port but doesn’t work)

So I found another acceptable solution which is using pages:

One page for testing and one page for developing. I want only the developer (is the one who run the command streamlit run app.py is the only one who can see the developing page (or use a really simple authentication to access the page - this approach is less ideal but is okay ) . Is there any way to do this idea?
Thank you

This helped me:

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