To limit your search to a certain folder within Email, Contacts, Calendar, Tasks and Attachments:
Use the "Folder Name" or "Folder Path" columns found at the top of the results list. Type in the fields below the column headers. For example, typing the word "Sent Items" in the Folder column displays only messages from the Sent Items folder.
Typing '-Deleted' in "Folder Name" refining column displays all results EXCEPT items located in the Deleted folder.
Use the "Path" column found at the top of the results list. Type in the field below the Path column header. For example, typing the string "C:\Program Files\Program1" will force X1 to only show files and subfolders in C:\Program Files\Program1.