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By default, the Gutenberg Gallery Block outputs full size images in 3 columns. This is excessive, especially on mobile, so I would like to set it in the theme or function file to output thumbnails. How do I do this? Changing the image size option in the Gallery settings seems to have no effect.

image size option in the Gallery settings

(I suspect this is because my homemade theme doesn't support these options correctly, but I cannot find any documentation on theming for new Gutenberg blocks).

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I know it's hard to believe but it's known and still unresolved issue in WordPress. It's impossible to output thumbnail size in Gutenberg Gallery Block.

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