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Allan
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The MacBook only supports dual displays including the built in display. In other words, it will only support one external monitor. Per the tech specs:

Dual display and video mirroring: simultaneously supports full native resolution on the built-in display and up to 4096-by-2304 resolution at 60Hz on an external display, both at millions of colors

The Lenovo C-Dock doesn't enable your MacBook to supply more display bandwidth than Apple provides. So, the mirroring you are seeing is expected behavior.

Allan
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