@leocg Thank you the tip
Lets hope this works for a while, I really hated that "new" and much worse version. As several others here pointed out it just adds extra clicks.
If there are others like me and dont like the new tab-cycler which is totally useless as its keep to the tab the mouse arrow points at (if the mouse arrow are placed in the horizontal mid part of the screen) this gets you the old one back.
opera://flags/#horizontal-tab-cycler -->> disable and relaunch