EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 164)

Analyzing Traces and Events
150 OTDR
Clearing Traces from the Display
To clear traces from the display:
1. From the main window, on the button bar, press Close.
2. From the Close File(s) dialog box, select the check boxes
corresponding to the files you want to clear.
You can use the Select All or Deselect All button to speed up your
selection.
3. Press OK to confirm.
If you had already acquired or modified (but not stored) some traces, a
warning message appears for each trace (even if the trace is hidden)
asking you if you want to save it.