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1. DEFAULT BLOG LAYOUTS ARE CONFIGURED IN THEME OPTIONS/BLOG & POSTS.
2. USE ESSENTIAL GRID TO CREATE MASONRY OR ANY OTHER BLOG LAYOUT.
3. CREATE NEW GRID OR USE IMPORTED STYLE AND CHOOSE POSTS AS ITEM SOURCE.
7. INSERT ESSENTIAL GRID ELEMENT TO THE PAGE. ALL DONE!
GO TO APPEARANCE/INSTALL PLUGINS TO ACTIVATE ESSENTIAL GRID, IF YOU HAVE NOT ALREADY DONE THIS.