Row Gallery
Row Gallery is a special Row, where you can control the spacing between columns and blocks within those columns at once. Plus, you can add a 'Masonry' effect to the row to make it's blocks organized in a clean, full grid.
For added flexibility, You can have any type of Blocks inside the Row Gallery not only Image Blocks, in the example below, we added a Text Block.
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Adding Row Gallery
You can add Section to your page that already have Row Gallery, in the Sections Catalog, find some of them under 'Photos' category.
Delete, change order and clone Row Galleries
You can manage Row Galleries like the basic Rows.
Add a Column to the Row Gallery
You can add a row by duplicating any existing Column, the maximum number of columns in Row Gallery is 4, if there are already 4 columns, the clone icon will not be displayed.
Gallery Settings
Click on the gear icon 
on the Row Gallery Menu to open Gallery Settings.
Masonry Grid.
When enabled, Blocks inside the Row Gallery will fill the entire columns heights to form complete grid layots.
Masonry grid enabled, the images forms clean rectangle. note that some images lost their original width/height ratio.
The same Gallery but with Masonry grid disabled.
Gallery Padding
Control the padding at the left and the right of the entire gallery, usefull to align the content of the gallery with the preceding columns in the page that have padding.
In the example, a baisc row with Text Block is above the Row gallery, both contents are aligned with large padding value.
