Maybe the following will do the trick:

    Right click on the desktop, click 'Screen Resolution'
    Click 'Detect' button on the next screen (when click on Detect, a new second monitor was shown on the right of the main display)
    Click 'Another display not detected' and under the multiple displays option select 'Try to connect anyway on: VGA'
    Click 'Apply'

https://helping-squad.com/fake-connect-a-monitor/