Hello @oparfon ,
when I am checking the help and the link for the all widgets there:

They seems to work.
When I am checking then the availibilty in the Studio Inteface:

So, for me seems that documentation cover the current widget available.
3D List seem not to belong to the current Studio functionality (comming with the installation). Possibly this is some custom widget? You can check if on your system are added customer widgets when you check in Documents/VuforiaStudio/Extensions where the additional customers widgets are added as extension. In a subfolders for the extension widget or widget group you could find the index.js file where e.g.:
exports.runtimeAngularModulesRequires = [
....
"panel3D-ng",
"list3D-ng",
....
];
there is the list of the custom added widget
If the 3DList is provided as extension possible you can find example and documentation from the source where you received this extension.