Tab stack are back, kind of. There should be option to "Move tab to Workspace X" in somewhere.

I would suggest to add option to give window a name too and then add possibility to Add to workspace of other window. I have 4 windows which contains plethora of tabs and arranging them using workspace is tempting but currently annoying -> drag tab to another window that contains desired workspace. For example I could have windows called Work and Joy and Surfing. Work could contain workspaces like Coding, Databases, Devices. When i am on Surfing window and find something to be checked later I could use menu to Move tab to Workspace Work\Databases

@louay-madanat You didn't ask for me but one of my reason is couple of hundreds of tabs. Transferring my precious session is not easy. I regulardy try Vivaldi but still like Opera more for my purposes.

Tab stack are back, kind of. There should be option to "Move tab to Workspace X" in somewhere.

Because of lack of tab stacks I've been using separate windows for separate things and I too often accidentally close one window instead of whole Opera and then I lost my fine tuned tabs. (And if I accidentally close second one I lost it permanently because there's no recent window -option after restarting Opera - that happened too.