is it even possible to connect two USB-C displays to one MacBook Pro 15" 2018?
Seems like MacOS intentionally shuts down one of them. I'm a bit puzzled why..
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You should absolutely be able to do this. From Apple's web site
Simultaneously supports full native resolution on the built-in display at millions of colors and:
Up to two displays with 5120-by-2880 resolution at 60Hz at over a billion colors Up to four displays with 4096-by-2304 resolution at 60Hz at over a billion colors
Thunderbolt 3 digital video output
Native DisplayPort output over USB‑C VGA, HDMI, DVI, and Thunderbolt 2 output supported using adapters (sold separately)
However USB-C/Thunderbolt can be a bit finicky/picky about cables and monitors. Perhaps if you shared your exact configuration (cables/lengths, monitors, etc.) we might be able to help. Just add that info to your original question.