The 'Stats From Current Bet Type Only' filter separates the data by Fixed Limit (FL), No Limit (NL) and Pot Limit (PL) games. The filter you want to use to separate fast from non-fast is the 'Stats From Current Cash Stake Only' filter as it is designed to filter the same way the Cash Results By Stakes report where se separate the same blinds/stakes fast and non-fast games using the 'Fast' in the Game Type description column.
Unfortunately while testing this to be able to answer you I discovered that it is only working for on the fast tables for some reason and had to write up a bug report for the developers.
HMT-6141: Stats From Current Cash Stake Only HUD filter not working on non-fast hands
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This issue has been documented in detail and provided to the developers to resolve. If you want to be notified when it is fixed please
send an email via the 'Contact Support' link and include "Notify Me When HMT-XXXX Is Resolved" in the subject line and body of the email.