I logged in to show my displeasure with Opera for downgrading the ONLY feature that makes me stick with Opera. I watch a lot of youtube and video pop-out helps like crazy with multitasking. I use it to keep an eye on the video while listening to the audio. And occasionally check back to the video tab if I see something worth watching clearly is on. Hence the new version was horrible to use. Please, devs, roll back.
And thanks to the people on this thread for telling me how to disable the new version. Much appreciated.