code: func (f *Form) SetHorizontal(horizontal bool) *Form {
  	f.horizontal = horizontal
  	return f
  }
docs: // SetHorizontal sets the direction the form elements are laid out. If set to
  // true, instead of positioning them from top to bottom (the default), they are
  // positioned from left to right, moving into the next row if there is not
  // enough space.