There are two options I know of:
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If your BIOS supports enabling/disabling integrated graphics, then change your BIOS setting to run on discrete. This should effectively disable the integrated graphics. Not all BIOS’ include this option. Sometimes it is worded as “Optimus” support, etc.
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Run on X and set X to run on the nVidia card as a the primary GPU:
Check out @computersavvy’s helpful advice for how to do that in the comment here:
https://discussion.fedoraproject.org/t/external-monitor-does-not-display-properly/77089/2?u=vwbusguy