Featured image low resolution on mobile view

[jvdklugt]

I have a problem with the iconic theme that featured images are shown with a low resolution in a mobile view.

When narrowing down the screen or when using a smartphone to view the post overview, the featured image is shown in 200px format, which causes a low-res view on mobile. How can I change this so that the featured images on the mobile view of the responsive theme shows with a higher res?

[Themonic-Support]

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