One small thing that I however still would love see to change:

If you make your Opera Sidebar on left to automatically hidden, then mouse hover it, it appears & blocks left side of current active website. On which in my case on most left also are panes I use regularly. And this causes many times some wrong clicks whether on Opera Sidebar or websites most left parts. if my mouse movement is not 100% correct.
If however if Opera Sidebar appears not above website, but it also moves website content, that problem would be instantly away.

Let me show you in a screenshot what I mean.

Opera Sidebar visible after mouse hover:

Below website most left part with sidebar away:

There you can see what is being hidden by Opera Sidebar.

Opera Sidebar & website IF Opera Sidebar NOT on automatic disappearing (WHAT I DO NOT WANT for another reason!):

This way I'd love to have Opera Sidebar AFTER hovering & appearing.

Many thanks in advance!

Best regards,
Volker