Reply To: Formatting Error on search form

You can configure the search bar in the main settings. The default value of it is

Select Code
From: [date-from value="+1" style="height:25px"] To: [date-to value="+8" style="height:25px"] Adults: [adults value="3" max="5"] Childs: [childs value="1" max="5"][submit value="Search"]

and should appear in one line if there’s no influence from other stylesheet classes.
You can insert any html, like labels, in that setting too.