System recovery does not recover non-Microsoft system components.
For example NVIDIA display drivers are not recovered!
Instead one gets Microsoft display drivers
which provide only to poor basic resolution
and support only one monitor!
The concept "system" has been re-defined for recoveries!
One has to manually recover systems components not provided by Microsoft!
I think you have misunderstood what System Recovery does: it recovers Windows state as it was just after being installed, before any third party content was installed.
Speaking from my own experience, I know that if I clean install Windows 10 or do the System Recovery, when Windows boots to desktop first time I only have default drivers installed and desktop shown on one display, but when I just let Windows there without doing anything, Windows will automatically download and install correct display drivers within a few minutes, and suddenly the external displays come to life.
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