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If I go Settings->Displays I can see 2 monitors. Same if I run in console xrandr

Screen 0: minimum 8 x 8, current 1600 x 900, maximum 16384 x 16384
LVDS-0 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1600x900       60.0*+   40.0  
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768      120.1     60.0  
   960x720       120.0  
   928x696       120.1  
   896x672       120.0  
   960x600       120.0  
   960x540       120.0  
   800x600       120.0     60.3     56.2  
   840x525       120.0    119.8  
   800x512       120.3  
   700x525       120.0  
   640x512       120.0  
   720x450       119.8  
   640x480       120.0     59.9  
   680x384       119.6    119.9  
   576x432       120.1  
   512x384       120.0  
   400x300       120.6    112.7  
   320x240       120.1  
VGA-0 connected (normal left inverted right x axis y axis)
   1280x1024      60.0 +   75.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  

this is my /etc/X11/xorg.conf

# Warning: This file is autogenerated by nvidia-prime. All changes to this file 
will be lost.

Section "ServerLayout"
    Identifier "layout"
    Screen 0 "nvidia"
    Inactive "intel"

Section "Device"
    Identifier "nvidia"
    Driver "nvidia"
    BusID "1:0:0"

Section "Screen"
    Identifier "nvidia"
    Device "nvidia"
    # Uncomment this line if your computer has no display devices connected to
    # the NVIDIA GPU.  Leave it commented if you have display devices
    # connected to the NVIDIA GPU that you would like to use.
    Option "UseDisplayDevice" "none"

Section "Device"
    Identifier "intel"
    Driver "modesetting"

On the other hand if I try to configure displays and go to Nvidia X Server Settings, second monitor is not visible at all. I have installed recommended Nvidia driver via System Settings->Additional Drivers, which as I believe are official ones.

Any ideas?

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