I had the same issue today after my Opera browser got updated - all my tabs were gone.
It's so frustrating that the workpsaces' tabs are not stored in the Sync Data and I don't understand why they are not adding these as well. 
Best posts made by L0ris
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Opera GXRE: [Duplicated]All of my tabs in all of my workspaces disappeared
Latest posts made by L0ris
-
Opera GXRE: [Duplicated]All of my tabs in all of my workspaces disappeared
I had the same issue today after my Opera browser got updated - all my tabs were gone.
It's so frustrating that the workpsaces' tabs are not stored in the Sync Data and I don't understand why they are not adding these as well.
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BlogsRE: Opera and ASUS partner to create special ASUS ROG edition of Opera GX
The ROG edition doesn't seem to work.. it wasn't launched yet?
To give a bit of more context, I used the download link from the blog post, installed that version, but I see no difference from the original GX one. There is no ROG theme, wallpapers or light effects in the Settings menu that I can activate.