To modify a gallery feed’s layout, choose Layout tab in the widget settings then click Feed Layout.
You can choose 1 from 3 available options:
To change the template of the post cards, in Layout tab choose Post Template
Pick 1 from 2 available options: Tile or Classic
To adjust the how many columns will be displayed per row, in the Layout tab, click Columns and slide the “Columns” bar to the number you want.
Notice: The number of columns decides the number of postcards per row for Grid and Masonry layout. But with the Carousel, it does not reflect the exact number of posts which actually have in each row.
You can also adjust the spacing/padding between 2 cards by sliding the “Space between images” bar.
When you are done, remember to save all changes by clicking the Save and Exit button.