Hi @aedanwells,
Newer versions of Cesium for Unreal find libraries by querying a directory instead of listing them explicitly in CesiumRuntime.build.cs. So the equivalent of commenting out that line is to delete Source/ThirdParty/lib/[your platform]/tinyxml2.lib from the Cesium for Unreal plugin directory (C:\Program Files\Epic Games\UE_5.3\Engine\Plugins\Marketplace\CesiumForUnreal_5.3 in a typical Windows installation). I suggest backing it up somewhere first.
I can’t promise this will solve your nDisplay problem, but it’s worth a try.