• From the Appearance > Go to Customize > Theme Options > Blog Page.
• From the Blog Page, you will see the section for Blog Layout Columns.
• You will see Single, Double, Masonry and Alternative layout for the blog page.
• Select the Masonry Layout. (If there is no sidebar, the masonry will be on three-column, otherwise, it will be two.)
• If the preview is fine, click on the save and publish button to save the changes.

Please comment below if you have any problem using this feature.