The program doesn't have the option, to manage the volume for the recording, in this case, you would be noticed that if you select the recordings Tab, then select your recording and select the Edit, this would open the WavePad program, that is the NCH Software to edit audio files.
If this is during the recording progress there is no option, select the Options/Recording then select your recording device and manage the volume manually but this would be just for your recording device.