Each grid starts with a folder with standard section padding and standard internal grid padding. For now, there is blank grids and ones with images, rich text, and CTAs on for both left and right. You can move the columns around in the experience editor to fix your needs. Just make sure that you have the correct mobile reverse grid selected.
In the future (once implemented), there will be sub folders with options for internal grid padding between columns (once the classes are implemented to be used in the grid 'extraClass' option).
2 Column - Neutral Light BG - No Padding Top Bottom