Just adding to this to echo what Robert was initially saying. It seems like a shame to have all the power and control of Editor X, only to lose all of those nice features when it comes to the stores app.
I managed to work the sidebars in, as well as top and bottom blank sections to imitate custom padding, but that feels very workaround-y. Certainly not intuitive for newer users.
Even if the stores settings menu had another slider in the layout tab for horizontal padding and vertical padding that would be miles better.
If it’s helpful, I can re-post this to the feature request section.