header background-image not responsive

I use the be-theme cleaner and don´t use the revolution slider for the header background.

I created a background image and inserted it under Header&Subheader/Header/Background.

However, it does not adapt responsively to different screen sizes.

Image 1 Settings in Theme Options

Image 2 resolution 1920x700 in the browser

Image 3 resolution 800x700 in the browser


What do I have to set and where?

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