The problem is - old menu had list of synced tabs across devices and that was really handy! Now you cannot even add on bookmars bar opera://activity page, and more - you cannot find it from menu or other Opera UI... First you need to google it, second you have to type it every time you need it in adress bar. This is very strange and bad changes to the Opera UI.
Hope this will be fixed or made some workarounds for this situation.