@shubhr0 Honestly, I had forgotten about this. I simply stopped using it at the time because I was too busy with other things. Then got dragged into some MS Edge stuff with the "Workfolders" which is kinda not really similar to Workspaces. Then I forgot about it. lol
I'm probably going to update and see if I can make it happen on purpose tonight. In the meantime, I noticed something in one of the other comments that I think I ran into as well but wasn't paying attention. If you haven't done anything else, or if it does crash on you, when you open Opera again and you see all your workspaces gone, launch a second Opera window and if not there, a 3rd and see if it doesn't magically appear.
I can't say why but when I read that other comment, something stirred in the back of my mind but I really can't place it. It's possible I'm just off my rocker but it can't hurt to try. lol