Another one bug I noticed is that in horizontal mode the 'scroll to top' feature doesn't work at all.
And it's logical to assume that even if it'll be fixed for the expanded panel, for the collapsed panel the feature can't be even fixed because the tab (only icon visible) will close instead.
The solution could be smth. between the autohide and pinned (collapsed) mode. Like it works in Edge.
When pinned it shows icons only (like in Opera currently) but after hovering it expands to previously predefined width.
2026-07-29_170320.png
So 3 modes in total> expanded/collapsed/auto-expand.
*There could be also the 4th option when the panel is not visible at all and appears only when touching the edge of the screen (like sidebar) but it's a bit more complicated option to implement as it needs option to move the vertical tabs panel to the right (otherwise the both sidebar and vertical tabs will appear).
As fo me, the vertical tabs are introduced a bit too early if the functional is cut vs horizontal mode.