Most forms are formatted with the label above the input field, but sometimes you might want to have the label and the input fields side by side.
Select the form field:
Select "inline" form the "Normal / Inline" option:
If it doesn't go inline straight away, check the width. Use "auto" if it's not already auto.
It will then look like this:
You can customise the positioning by setting the width on both the field and the label. By default, it's 30% for the label and 66% for the field although these values won't show in the interface.