EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 157)

Setting Up the Instrument in Drift Mode
Optical Spectrum Analyzer 149
Setting Up Drift Analysis Parameters
3. To apply the settings from a favorite file to the current analysis setup,
select a file from the favorites list and press Apply Selection. The apply
selection button will be enabled only when a file is selected from the
favorites list. When the Apply Selection button is pressed, the content
of the file will be loaded in the other tabs of this page. To make these
parameters effective for the next acquisition you need to press the OK
button.
4. Press OK to load the configuration and close the window, or press
Cancel to exit without saving.