I often need to have browser tabs side by side to work seamlessly on various projects.

This leads me to opening a new window of Opera. The various sites I visit are then opened on the instance of each workspace.

It would be great to be able to seamlessly merge that window back into the original workspace.

Example: in WS1 I may have 20 tabs open. When a particular task requires me to quickly go back and forth between two of those tabs, I move one to a new window of Opera. Often, I will need to perform other tasks before that task is complete, so other tabs get opened in the new window. However, those tabs are not associated with that WS anymore unless I drag them back to the original WS1 before I close the new window.

I'd like the option to integrate all open window instances of a WS into one so that my tabs are all saved if I need to close my windows (or some updates takes hold and automatically updates my laptop for me).

If I'm missing something simple here, let me know - I am new to Opera, but I am singing its accolades everywhere (pun intended!)!