Capture noise print greyed out

[Amrit23244850zdtd]

I select the background noise, click on multitrack, and comeback, capture noise print is available but it sounds slightly different. if I play the selected portion it's greyed out again. 

I have tried copy-paste to increase the selected area. sometimes it works sometimes it does not. I am so frustrated I can never access the noise print option.

Kindly help me with this issue. (adobe adution 2022)

Thank you!!

[SteveG_AudioMasters_]

Noise reduction is designed specifically to work with single files, so you won't get a valid noise print from anywhere in Multitrack view. So what exactly are you trying to achieve here?