Both USB C ports support Display ports as well as Power delivery. So they should work exact same way there is no need to change anything in bios.  Unfortunately, both ports are on Motherboard and repairs would be expansive (Entire board) 
I'm using the USB-c port to connect my 5490 with a Dell 3422 monitor and provide power. After one year the contact get's loose more and more and I need to wiggle the cable to get a connection. Looks like the USB-C port at the laptop is worn out.  Two questions about this: 1. Is it possible to repair / replace this port without a bigger repair action - then I might utilize the Dell support for this to do this at my home. 2. Can I somehow use the second USB-C port for the time being for power and monitor? Plugging in the cable does not do anything - but maybe I can switch the USB-C monitor+power function somehow in the BIOS?  
How can I use the second USB-c port for monitor connection?