Data Bridge uses Form Builder designs for creating the forms.
you can use form builder to create a preset that has the layout you are trying to achieve, in form builder, go to the design tab to create your design settings, when done you will be prompted to save the settings as a preset, you can then select the preset in Data Bridge.
on the design tab, select the Form Elements -> Labels section to change the label placement. you can select top / left to have the labels placed above the form elements.
in the form section, you can set the form width.