The Instant View Editor uses a three-column layout, so you really want to use it on a desktop screen that's wide enough. Sorry for the inconvenience.

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Issue #1

for cover image you can set best quality image, look to my template, i know it is small issue but we must do every template clearly.
Максим³
there's no direct link to the image with highest res in the srcset: https://hastebin.com/vinocuhuru.cpp

also the image you're using in your template is 4752x3168, which is bigger than optimal resolution(range is 1280px-2560px), see 6.2.1 Image quality
Type of issue
IV page is missing essential content
Reported
Mar 10, 2019