@burnout426 Yup, I had seen about Session Buddy when originally looking for a solution to my problem. I have it installed now as a back up.
Didn't know about the "All tabs to a speed dial folder" thing. I'm gonna try that out. Might actually be better than a workspace.

Oh ya. I just tried out that tab tip you suggested, and I love it. Gonna transfer all my workspace tabs into those now.

@burnout426 Yup, I had seen about Session Buddy when originally looking for a solution to my problem. I have it installed now as a back up.
Didn't know about the "All tabs to a speed dial folder" thing. I'm gonna try that out. Might actually be better than a workspace.

Oh ya. I just tried out that tab tip you suggested, and I love it. Gonna transfer all my workspace tabs into those now.

@leocg My Man!!!! You Just Saved Me So Much!
So, I had happened to save my sessions Right After I had lost my windows and tabs. I kept them in a folder hoping there might be a way to save them. Loading that session info back into the Opera folder set everything back to Right After the windows had closed, and I saw what you were saying. I didn't notice it before, but I noticed it this time, and you just saved all my everything.
I can not express the relief you have given me, cuz I got so mad when I realized what had happened. Thank you so much.

I saw "Hidden", because I have never noticed that magnifying glass before. I have never needed to search through tabs, so never recognized that icon. If I even needed to re-open a closed tab, I went to the History sidebar, like I would assume most people did. That is how I did it with Chrome, and in Firefox after that. I would naturally expect recently closed items to be found in History. But in the History window, it does not retain the information that a tab was part of a closed window if you close all of your windows. This is my issue. It does remember and restore that in other browsers, even if after you close everything.
The History tab was the first place I went to when I had made my mistake, and it only let me open a single tab at a time. It would not recover the whole window.

Just tested that by closing a second window, closing the last window, then opening a closed tab from that window. You method works, but it's too late for me now. My closed main window isn't in the recent history for that anymore.

Still, a method exists native to Chrome, Edge, and Firefox that restores windows, and says so. Opera only has tabs. Nothing it is says to "Restore Window". Your method it even hidden and not in the "History" window or sidebar where you would find the "Restore Window" option in most of the other browsers.

I just accidentally closed all my tabs because one of my windows froze. I had 3 windows open. My main, then two side windows. One of the side windows froze, and I tried to close everything at once to recover it, but it closed my main window, then the other side window. Then when I tried to close the frozen side window, it was too late. Everything was gone. All my main tabs, all my tab groups, everything gone.