Predefined inquiries come out of the box on the sqliteviz instance. In sqliteviz deployed on Github Pages there are no predefined inquiries, but you may see them if you use sqliteviz integrated into another app.
These inquiries are shown in
Inqueries list with a special label on the mouse
over (fig. 1).
As a user, you can't rename or delete a predefined inquiry. You can't save changes in a predefined inquiry, but you can save them as a new inquiry. The rest operations, copy and export, are available.