Note: The posts block is set to display 10 posts, but you can increase this if you wish and subsequent posts will adjust their position to fit the layout.

At the top of the CSS in the Custom CSS toggle in the parent Row Layout block, you will find the following:

:root {
-bb-stag-posts-1-offset: 10%;

This adjusts the depth of the offset. You can change the 10% to any value you like, and even change the unit (to px, vw, em etc.) and the layout will adjust to your new value.