Further to AudioTracks comments, if you are using Utility Tracks, these are not available in the Volume Changes section of the Bar Settings. So for RealTracks that are loaded onto a Utility track, you would have to use the new volume automation feature that is in the 2022 version.

Or if you have the 2021 version, you could add silence to sections using the Audio Edit window.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Audio_Edit_Silence_Utility.png (114 KB, 172 downloads)

Best,
Chantelle