In the Select Dimensions Sources dialog box, there is a checkbox for Recursive Search. By default, it is selected whenever Use File Patterns is selected:
When Recursive Search is on, Dimensions CM generates wildcard patterns that match an entire directory tree, or a file anywhere in the directory tree. For example:
**/*@src/
If Recursive Search is turned off, Dimensions CM generates wildcard patterns that search only in the current directory:
*@src/
Recursive Search is also disabled if you deselect Use File Patterns.