
Hi @catmeow
Does it blur with your own picture, or the background pictures it recommends?
If you're using your own picture, please use pictures with 2k resolutions or higher. It will be clearer with higher resolution.
If you're using the background pictures it recommends, I'm afraid there's no way to control the resolution. The background pictures new tab page recommends seem all to be 1920*1080 resolutions, if you're using a higher resolution monitor like 4k monitor, it will be a little blurry. For this situation, I think you can only provide feedback to Edge team by pressing Alt+Shift+I in Edge to ask for higher resolution background pictures.
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Regards,
Yu Zhou