WD19, compatibility with HP E24Q G4 monitor?

@John_Zee  The WD19 is a regular USB-C dock, not a Thunderbolt dock. And the Latitude 5511 only supports DisplayPort 1.2/HBR2, not the newer 1.4/HBR3 standard.  As a result, the WD19 when paired with that system can only run dual displays up to 1920x1200 each or a single display up to 2560x1440, plus some small amount of bandwidth that's being used to run that second display at a lower resolution.  If your Latitude 5511 was ordered with Thunderbolt 3, which I believe was an option on that system, then you could get the WD19TBS instead, which with that system will be able to access 4x more video bandwidth, enough to run dual 4K 60 Hz or triple 2560x1440.  If you don't have Thunderbolt 3 or don't want to get a different dock, then connect one of those displays to the HDMI output on the Latitude 5511 itself so that its bandwidth requirements don't have to be met over the dock link.

In terms of how many displays you can run, the display outputs on that system are wired to the Intel GPU.  The NVIDIA GPU only operates indirectly via NVIDIA Optimus when needed, so it doesn't matter here.  The Intel GPU in that system supports up to three simultaneous independent displays, including the built-in display if it's active.  But you also have to have enough bandwidth for the display setup you want to run.