A Datamanager wants to see all fields with all its data. Qlik Sense don't provide a smart a fast solution. Suboptimal workarounds:
- Previews in the Datamanager or Datamodel tab are only previews and don't show full data
- When using loading script, you can not use Datamanager tab
So you have to build a temporary app, implement a table box and then manually pull all fields into that table.
I would say, this is very inefficient and not state of the art. When you look what mostly DMBS-Tools provides, then... you missed this powerfull function!