Yes, unfortunately our current editor doesn’t support an option to change the layout, I’m really sorry for the inconvenience!
We’re actively transferring our widgets to new updated editor, where the layout options will be definitely presented. For now, current layout can be changed only through changing settings manually.
However, I also see that the second widget has images with different dimensions and different text length, which also affect the widget layout.
Just a quick suggestion. When the developers supply custom CSS for a widget, they or you might consider adding a comment at the top so that later on we can remember what the css does - especially if there is more than one entry in the Custom CSS box. Here is what I used on mine.
/* Set background color to FB blue color */
.eapps-facebook-feed-inner{
background: #3B5998;
}