I wanted to ask you if there is any NodeType-Definition to show a help message for a entirely NodeType?
Vendor.Package:Content.someElement:
ui:
help:
# label or title
label: 'Information'
icon: 'icon-info'
message: 'With this Element you can do this and this.'
It would be not to hard I guess to built a custom view yourself. You can look at the NodeInfoView in Neos.Ui to get an idea for a custom plugin.
Or you use the ColumnView or TableView and your own datasource which can provide some strings configured in the NodeType and show them in one column. I use this for a url preview for example.
The help message you can use in the ui group is only for the creation dialog.