Step 1:
Select the audio clip that you want to edit. This can also be a built-in audio clip on the video track.
Step 2:
Click the Audio Properties button on the toolbar to open the audio tools. There, scroll down in the audio tools and click Noise Removal.
Step 3:
Use the Noise suppression slider to set the amount of noise you want to remove.
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Start with low levels and listen to the audio to check if the noise is gone.
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Don't set the noise suppression too high if there isn't much noise because it can start muting other sounds.