Dropdown box not showing for multiple displays option in settings despite being directly linked with cable.

[NeverSimple_754]

I have 2 identical all-in-one notebooks, the HP detachable 10-p0XX, that I want to connect the detached screen portion of one to use as an extra display screen with the other one. I tried connecting it wirelessly, but it only recognized it as audio. I purchased a micro to micro HDMI cable to directly connect them. I have restarted both devices while using the cable. Under settings->display->multiple displays, it is not bringing up the dropbox with options which indicates that even though the cable is physically connecting them, my computer is still not recognizing the second device. The

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