The sample had an oversized grid cell for the thumbnail size, normally I'd have the cell just a little bigger than the thumbnail size (300px). The thumbnails and grid cell size can be sized independently - I don't think that is needed for calibre.
I'd rather have the emblems (icons in iMatch lingo) above the image and any words under the image. Another reason I don't like showing them on the cover is that some covers come with 'emblems and icons' already emblazoned on them, eg Pulitzer medals
One idea that came to my mind was the ability to show column icons in the cover grid, I find them very useful in the library list as indicators
BR
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