EDIT: Never mind.
I’ve been studying the responsive image methods in the Atomic theme and I understand how the values in page_theme come back in the image block. I’m wondering however if it is possible to set default values for those options with thumbnails I create. It looks now that I have to manually set the options each time I add a image block.
So xl will automatically use thumbnail_xl for example and lg uses thumbnail_lg.
‘xl’ => ‘1200px’,
Something like this: ‘xl’ => ‘1200px’ = ‘thumbnail_xl’