Responsiveness in Gutenberg Editor

I like Gutenberg as I am making my basic website. The site is fast and there is no overuse of div tags like Elementor.

The issue I have is responsiveness. Why did they give this mode (marked in image) when we cannot use it to make the page responsive? Is it just for viewing how my site will be displayed in mobile or tab?

https://preview.redd.it/6dmmutz17zqc1.png?width=363&format=png&auto=webp&s=fb475af46d6bc2e915fe700996b313fd669706f7

 

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