EXFO FTB -5240S/5240BP Optical Spectrum Analyzer for FTB 500 (NS-1434) - Manual (Page 265)

Setting Up the Instrument in EDFA Mode
Optical Spectrum Analyzer 257
Setting Up EDFA Analysis Parameters
5. If you want to apply the above settings to the active trace, select the
Apply to current measurement and re-analyze option and press OK.
6. Press OK to load the configuration and close the window, or press
Cancel to exit without saving.