Hey Viliam,
Please see the screenshot below.
Is that the image you’re referring to as high quality? It’s just 1201 x 766 px. High quality starts from Full HD size and it’s 1920 x 1080px. And, as I’ve said,
Our theme can do nothing about that. It’s the browser’s display and it’s the same regardless of the theme. There’s no way to make it sharp. That is why I said:
You can do that by choosing the Fullwidth Content Layout or increasing the Site Max Width, Site Width and Content Max Width
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Just a tip, you will want to use PNG image format for interface screenshots. See why here: https://www.diffen.com/difference/JPEG_vs_PNG
You might also want to increase your image’s contrast in an image editor like Photoshop.
So that the browser will display your image as it is and not perform scaling on desktop, you might want to upload the exact resolution that you need as long as it’s lower than the Content Width.
Thank you for understanding.