I searched the forum and there are many speaking about it but no code, am I off base here? Is there an easier way to change archive post summary thumbnail size globally? Perhaps a setting that changes them all?
Resizing the excerpt thumbnail is not working, it still stays at 200X200.
But the featured image is cropped to 150×150 (standard wordpress thumbnail size) and you will have to alter the loop itself to pull the original image. Or change the thumbnail size to 300X150 in Settings/Media. FYI that will affect only images uploaded after changing setings.
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