How to extend screen on a secondary monitor in Android-x86? I'm looking for a way to get two separate (i.e. &quot;Extended&quot; or split) display outputs on my Android x86 setup.
It appears that I need to modify the content of /grub/menu.lst file, but every guide that I have found instructs the user to either clone (i.e. &quot;duplicate&quot; or mirror) the displays, or worse, it instructs the user to entirely disable the internal LVDS display.  This is not what I want.
What I want is to simply have a separate output for each of my displays (two 1920x1080 monitors using HDMI.) This is something that is available on many Linux distros and even Windows.
Is what I want even possible on Android x86 at the moment?
A quick check of android-x86.org shows at the bottom:

Development (2019/10)
What we are working on now

Android 10 (Q release) porting (q-x86 branch)
Upgrade kernel to 4.19 or newer
OpenGL ES hardware acceleration for intel/radeon/nvidia/amdgpu (pstglia, mauro) and virgl(robh) GPUs.
HDMI audio (cwhuang)
LineageOS integration (jjm)
Hardware accelerated codecs

To-Do List

Multiple displays support
Better power management
Miracast


So the feature Multiple display support is on the To-Do List and probably dependent on OpenGL ES hardware acceleration efforts.
So as of 2019-10 the feature you want isn't available.