After you select Code Style | Braces Layout in the left pane of the ReSharper Options dialog, it looks as follows:

You have the possibility to alter the way ReSharper automatically positions braces. The settings also affect the way ReSharper reformats your code; in particular, there are several ways to force ReSharper to enclose single operators in braces (for example, after if or for operators).
ReSharper Options | Visual Studio Settings | Code Style Settings | Braces Auto-Insertion and Placement | Code Reformatting