Those options disappear when the cable is unplugged. Also, only when the HDMI cable is plugged in, I have additional options on the Display settings page, about what to do with the second display, such as mirror the primary display. When the cable is unplugged, that disappears. When I enter Settings on my laptop (Start -> Settings -> System -> Display) while the HDMI cable is connected, I get a blue rectangle on the Display settings page that has a "1/2" displayed on it. We tried uninstalling and reinstalling my video driver. We tried rebooting both laptop and projector in various orders.
I tried my laptop again, and it still didn't work. I tried a colleague's laptop, and the projector worked fine with that other laptop. Now, almost two years later, when I tried to do that again, the projector showed only an empty blue screen. When I taught at school before coronavirus, I used to plug an HDMI cable into my laptop, and the machine in the classroom would share my laptop's screen image through the projector.
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