can you convert stereo recordings to monaural?

I have numerous Opera recordings where the aria’s are all on one channel during the performance and I want to go “old style” by just having both channels together. can Audacity do that?

Tracks > Stereo Track to Mono.

“Habt dank” (thank you very much) Koz. worked perfectly for listening on a headset. I am new to using Audacity and I appreciate the help. I’m somewhat surprised my Roxio RecordNow does NOT offer this option.