Hello. How do I hide the bar number?
Click on it, Window>Show Lower Zone, you should see the option there to hide it.
Shows the option in Write mode, also can be done in Engrave mode.
Or are you asking hiding all bar numbers?
Library > Layout options… Bar numbers
Additional note: In Layout options, in the Right zone you can choose from Full score and individual instruments and set bar number (hiding) options for any or each.
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Yes, I want to hide the entire bar number of the song.
Just amended my answer, Layout options 
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Thank you ^^ It’s solved
Good to hear, now you can progress onward