Help, I can't extend the monitor screen connected to Dell Optiplex mini tower to my HP AIO computer...

[Meagan Ritrovato]

I work from home and have a HP AIO computer, and was provided an Dell Optiplex mini tower for work. I have a VGA to HDMI adapter connecting a single monitor(HDMI1 port) to the Optiplex tower(VGA port), and the HP AIO (HDMI port) is connected to the monitor (HDMI2 port). Only the HP AIO screen will extend to the monitor, which can only be seen by switching the monitor source from HDMI1 to HDMI2. I need the monitor (HDMI1) screen to extend to the HP AIO, as it displays the workspace desktop from the Dell Optiplex tower. I tried connecting the HP AIO to the tower just as I have the monitor, but a

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