depending on your monitor Samsung DeX Mode can be used with a type-c cable input. The monitor has to support it as well as the cable used. I had a situation with a 15.6" portable monitor that was able to support Samsung DeX through one of its type-c ports but I could not use the OEM type-c cable included with my Note10. Oddly enough I had to use the cable included with the monitor for DeX to work.
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