@oberlyn the new layout for panels in Snapshot is a definite improvement over the layout in Beta -- there's more space for the content. In Beta there's wasted space for the page title. You can see more history, bookmarks, etc. in the new layout. I didn't even realize the buttons (what you called labels I believe) moved until I read this, so not an issue for me; I am thankful, however, for the extra useful space.
Beta:
Snapshot:
As you can see, the moved the page title up into the title bar where, automatically, it belongs. That frees up its previous location to display more content, but the buttons no longer fit where they were before.
Moving the buttons to the bottom also makes sense, rather than trying to cram it into the title bar where it used to be for a couple reasons. For the moment, it looks better giving everything room to stand on its own and not clutter the title bar.
Next, and in my opinion more importantly, placing the panel buttons on the bottom toolbar provides ample room for more buttons, that is to say more panels. As Vivaldi Android matures it would be great to see this feature expand -- panels is one of the most powerful and productivity enhancing features of the desktop browser in my opinion.