Ah gotcha now. I was thinking it was always on the other line. Its definitely possible and you have two options

1. Add all of the fields to one row in the designer and give the fields a css class like "one-row". In the CSS pane just add this CSS

.one-row {
  width: 25%; /* 100% / total # of fields */
}

downside of this is if you have too much in one row it can get messy and is hard to multi-select fields.

2. Use a section to set the widths for everything you want. Hide the section label and give it a class "hide-padding". In the CSS pane use this CSS

.Section.hide-padding {
  border: none; /* remove 1px border */
  & .fl-section.fl-component > div > .pane {
  	padding: 0px; /* remove section padding */
  }
  & .line {
    margin-bottom: 0px; /* remove section padding */
  }
}

Downside of this is the designer looks wild, but the end result is the same.

I'd probably go with option 1 as its a little simpler.

Np!