Mobile and desktop images

Hi Support

I am creating a pages for my customer and I found the following problems:

1. The images size on desktop and mobile seems not able to separate the size. I have loaded a blank 1px x 1px on desktop version and a pic 1920x768px on mobile version. I found that the desktop version also use the size on mobile version and make my page have a lots of space with blank image. How can I resolve it?
2. I found the desktop page using maximum size to display the pictures in slides pages. The mobile page looks fine. How can I resizing the slides on desktop?
3. Can I have difference widget zone for desktop and mobile?

Greetings,

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Please raise a ticket in our support system and provide us with access to your store. As well as steps to reproduce the issue.