Glenn, if the three “tracks” (aka video lanes) are synchronized angles on the same event, it’s best to first create a multicam clip which is designed to cut between those angles.
If it’s just random b-roll but you want dissolves or dip-to-black fades either between those or to/from the primary storyline, you can put those b-roll clips in a secondary storyline. IOW select the clips and do CMD+G. To revert it’s SHIFT+CMD+G (Break Apart Items). Maybe you already did that.
If by chance you’re dumping a lot of stuff in various full-duration “tracks” to facilitate material selection, with FCPX it can be better to first curate and organize the material in the Event Browser, then query that and add connected clips as needed. However to allow transitions those would need to be in secondary storylines — where needed.
One exception to that is continuous splitscreen (e.g, 2×2) so when adjusting timing all clips from each quadrant are locked to a specific lane.
Maybe you already know this but here is a brief tutorial from Ripple Training about using alternate storylines: https://youtu.be/nGK3MFqohWw
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