Sometimes you may be working with a stereo file that was recorded with isolated tracks/speakers on the left and right channels. With Descript, you can break those files out into individual tracks to either isolate one speaker, or combine the two tracks into a multichannel sequence for greater flexibility while editing.
To do so, open the the Media Library, click on the file options / ellipsis (...) button, then select Separate into mono files.
Once complete, you will see two new files in the media library for each channel of your stereo file.