Thumbnail size issue

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If your site contains any square size image you can use that size under media settings for post grid layout editor

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If you don’t see any square size image, then you can build it as following


#1, please add following code to your theme functions.php file

add_image_size( 'center-220', 220, 220, array( 'center', 'center' ) );

#2. install Regenerate Thumbnails plugins

Then rebuild thumbnails,

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Now you can choose “center-220” on post grid layout editor

Hope this helps.