I’ve found that you can Right Click each that is unseen, and toggle “Enable” to disable the clip in the timeline. This will make the clip label a dark shade, showing you that it is toggled to disabled.
My method is to add a cut point to the video when it is covered by a higher tracks clip, dragging all the visible clips up one track, and keeping the unneeded clips on the lower track.
Once I have lifted all visible tracks up, I will select the entire, unneeded lower track and disable the clips with the “enable” toggle switch when right-clicking the clip in the timeline.
This to me feels like a less destructive workflow over deleting or trimming clips.