Explain why the preview config option is important. Consider using text like:

```
If the user's view is empty, show them a notification explaining why no data is being 
displayed. The notification is not shown when the 'session.defaults.data.preview' 
config option is present. When that option is being used, the user's view is overridden
when making requests to the preview endpoint so the data(order aside) being shown 
in the results table will not be affected by the columns(or lack thereof) the user has
chosen.
```