If you want to change the maximum default number of drivers, so for all upcoming heats.
Follow these steps:
1. Open the Fast Configurator and go to “Resources”
2. Click on “Karting”
3. Click on “Karting resource”
4. Go to “General" and then you can change the maximum number of drivers for all the sessions.
5. Click on “Ok” at the bottom.
Note: The changes will be taken in the system the next day.