@vux777: Is there a solution to the inability to detach the V7 extensions from the sidebar starting with Opera 70.0.x as the opera://flags/#sidebar-extensions-in-browser-sidebar switch that had made it possible has now disappeared?

Caution! If you are using this extension now, refrain from auto-updating to Opera 70.0.X, as in this new version the opera://flags/#sidebar-extensions-in-browser-sidebar switch seems to have disppeared. So the V7 extensions can no longer be detached from the sidebar.