I recorded with a SHURE SM7b using aLambda interface but my sound was only recorded on the right. How do correct this next time and record stereo?
All mic are mono mic. You can save as stereo with many software.
With this recording you can just copy the right channel and paste to the left channel.
For future recordings you can either record mono or set your DAW to take input 2 from your interface for both left and right channels.