Hi, do you actually have a graphics driver installed? I remember when I first installed Win 10, many moons ago, it was 2-3 days before the graphics driver was installed. Wouldn't expect that, really.
Check in Device Manager.
Could be a generic W10 video driver causing problems, can you change settings in settings > system > display? Is the problem only in Opera? Does the same thing happen in IE and Edge? You might have to install a driver from your computers manufacturer to get back the way it was, or it could be something within Opera that can be changed.
Please populate your system specs System Specs - Fill in at Ten Forums
It's easier for others to help when they know what you have