The Calendar view is one of the best ways to search for Classic Reward seats. This way of searching for Reward seats excludes Classic+ and will only show you Classic Rewards seats.
It can only be done on the desktop version of the Qantas website.
Login to your frequent flyer account on the Qantas website.
Drop down 'Book' and select 'Multi-city'.
Select 'Use points - Classic Flight Rewards Only', type in your 'From' and 'To', click on the calendar.
Select 'Flexible with dates on all flights' and select your date.
Select your number of 'Passengers' and 'Search Flights'.
You will now get the calendar view. If you have put in multiple segments, there will be a calendar view for each segment. If you received a '9200 Error', this means there are no Classic Rewards on or around the date you entered. If you receive another error, try clearing your browser history/cache.
Ensure all Travel classes are selected, for all to appear on the calendar.
If you have any questions, let me know.