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@skydreamer-free I think i have found a way to restore immediately after closing. A few minutes ago i accidentally close my main opera window again. 
As I reopened and see only one tab is there. Then I right click the top bar, selected reopen the last closed tab (CTRL + SHIFT + T is the shortcut I believe) and that's it!!! All the tabs gone came back!!! OMG I am so relieved I can't handle another loss in the same month. 
Why on earth would somebody remove a handy tool that we happily used? 
Search and last opened can be used simultaneously right?
@skydreamer-free hi, unfortunately there is no way to recover as far as i know. I had the same issue a couple of times over the years and it is so sad that i searched everywhere for a solution but nothing comes out. Sorry.
It would be so good if opera had a snapshot of the links active in the browser periodically like a windows system recovery.