@kamil7165: Here here! The new sidebar behaviour is too clunky. You cannot reorder icons. Too much space wasted. It steals space from the tabs bar and it is not even resizeable as neededl. (It can be resized, but only up to a point - which is insufficient for me).
Please, opera staff, fix this new bar or use the "Extensions bar" code, instead of the browser bar, for this unified functionality.
It would be more functional and less space-hungry, while still allowing for the unified functionality you're seeking.
I can wait on an older version, but not forever.
p.s. Dear opera makers, please remember that there is still people with monitors less than FHD, and also that there is people whom do not like to browse full-screen.
Would you cater to those audiences, please?