A voice sounds clear on its own, but disappears when the music returns. Listening to one track is useful precisely because it leaves something out. Mute and solo controls let you ask narrower questions, provided you remember which question you are currently hearing.
Give the buttons a specific job
Audacity’s playback documentation describes track mute and solo controls for hearing selected parts of a project. Exact interactions can depend on settings and software version, so inspect the active buttons rather than relying on a remembered shortcut.
For an interview edit, you might isolate the guest’s track to locate an unwanted chair sound. That answers whether the sound exists on that track. It does not yet tell you whether it is distracting in the complete mix.
Compare in context
Restore the other intended tracks and listen to the same passage at a comfortable level. Music, room tone and another microphone can change what is noticeable. Do not increase the overall playback volume merely because the isolated track sounds less full.
Write a short note about the state used for your judgement: “guest track alone” or “full programme.” This helps if someone else reviews your observation later.
Restore before the final check
Review the active mute and solo states before making a delivery file, following your editor’s export behaviour. Then listen to the actual exported file rather than assuming that a correct-looking timeline guarantees the intended result.
Use the delivery-file listening check as the last step. Isolation is a diagnostic view. The programme your listener receives must still be assessed as a whole.