1

Select the Audio Clip

Click on the audio clip you want to adjust in the timeline.
2

Open the Control Panel

Click the Speed / Volume / Pitch icon in the top-left corner of the timeline to open the control popover.
3

Preview and Adjust

Adjust the values as needed and preview the effect.
4

Apply the Changes

To apply the same settings to all speeches by the same speaker, check Apply change to all speeches of [speaker].Click anywhere outside the popover to close it and apply the changes.
You can also adjust speed by stretching or shrinking the audio clip directly on the timeline.