Banner picture full detail for different scree sizes

Hi, I’mre designing a website for client. I’m using RW8 engineered theme. The banner picture is chosen from a stock picture - not unsplash source. I resized it to the recommended size for the theme. However I can never get it to show correctly in different screen sizes. There is always part of it missing either from sides or height. How can I get the full picture always show with different screen sizes?

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