This is the standard mode, the default and the first created mode of Digi Showcase.
By this mode, you can create a table with your items. You can set how many rows and how many columns you want to use to arrange your items.
The total number of displayed items is obtained automatically by multiplying rown per columns.
Please note that when you set the columns number, due the Bootstrap based layout, only numbers which can divide number 12 can be used (1, 2, 3, 4, 6, 12). Other numbers would generate a messy layout in the frontend.
Even if the look generated by the module in this mode seems to be a table, the code doesn't contain an HTML table, but instead it's a Bootstrap based HTML layout.