MacBook Pro

Problem with Dell monitor and Macbook Pro

My dell monitor is connected (via HDMI) to my new Macbook Pro (which I use for LR and PS). It worked briefly, although it did not show my whole laptop screen, only the PS image. However now dell monitor only shows the Mojave screen picture. It does not show what is on my laptop at all. In other words the connection seems to be made, but something is preventing it from showing my laptop screen.

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