Hi Jean.
1) DBA Cockpit: Naviagte to Space->Databases. Select a database. In the details section (tab 'Database') you will see a 'Options' group that contains 'Truncate Log in Checkpoint'.
2) With isql you can call sp_helpdb which will show you in the 'status' column if trunc log on ckpt is set. Or you access the system tables (here master..sysdatabases) directly. The information is stored in a bitmap in column status.
Regards,
Jan