In the Timeline view, select the clip or clips you want to delete by doing one of the following:
To select a single sound clip, click on it.
To select a series of sound clips, draw a rectangle around them by clicking just outside of the clips you want to select, then dragging the mouse cursor all the way to the last clip you want to select:
To select a series of sound clips, you can also click on the first clip you want to select, then, while holding the Shift key, click on the last clip you want to select. This will select all clips between the two clips you clicked on, inclusively.
To select several sound clips, press and hold Ctrl (Windows/Linux) or ⌘ (macOS), then click on each clip you want to select.
Do one of the following:
Right-click on the selection and select Delete Selected Clips.