"Layered Audio Editing"
When you bounce clips, the audio is rendered and placed in a new layer within the same track and the original layer is still kept underneath in case you want to delete the bounce and do it again. In "Layered Audio Editing" (type that into the search bar of the pdf manual to see exactly which page this is talked about), multiple layers can be hidden WITHIN the same track (not needing to create a new track), and any layer underneath is automatically muted. This kind of "hidden stacking" is very useful in many different situations. You have to toggle on the "view audio layers" selection in the view menu to see audio layers.
The way you are viewing it now can be visualized as a "top down" view. Then when you toggle to view audio layers, you can think of it as shifting a 3d camera to a "side view." That's why it seems like you are "revealing" another layer underneath when you drag the clip to the left or right.
Also, if "layered audio editing" is selected under timeline settings, dragging the edge of audio clips does not overwrite, but can then be an easy way to create crossfades with a higher level of control.
This ONE feature is what got me to make the final jump into Resolve a couple years ago. I was used to how my other DAW could do something similar, but when I figured out how to enable Resolve to do it BETTER, my jaw dropped and I was like, I'm all in, LOL
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