When using my second monitor, I can't get it at full, native, resolution, it only shows an option for 1280x800 instead of 2560x1440. When I disconnect the first monitor, it is capable of displaying the native resolution. Both my monitors are connected to DisplayPorts via a Dell dock. I am using a Lenovo Thinkpad, Windows 10, with Intel UHD graphics card.
I am using this Dell monitor:
https://www.dell.com/en-uk/shop/dell-24-monitor-p2423d/apd/210-bdeg/monitors
And this dock:
https://www.dell.com/en-uk/shop/dell-dock-wd19s-130w/apd/210-azbx/docks
How can I resolve this? Do I need to use HDMI instead?