To modify feed's layout, simply click on Feed Layout in the Layout tab and choose from 3 built-in layout options.
Notice: The number of columns, which usually will dictate the number of post cards per row for Carousel and Masonry layout, does not reflect the exact number of cards that appears each row in the Grid layout. This number is different for the Grid layout as shown below.
You can also change the spacing/ padding between the cards by sliding the Space between images (px) bar.
To change the template of each post card, either choose the Tile or Classic template in the Post Template area.
When you are done, either move on to modify the feed's Layout or click Save and Exit button at the end of the app.