by WhiteRider » Sun Feb 16, 2014 11:47 am
We generally don't recommend doing that - all of your history can be useful as a learning aid and as a record. If you want to see your recent results you can do that using a date filter.
However, if you do want to you can create a new database and set it to be Default and Active so that it is used for all hands played from now on (and you can import your recent games too if you like, using Get Hands From Disk). To do that go to Database > Database Management.