I got rid of DAS so I can't check exactly what I did but it's not that you want to get rid of darkpools entirely, they trade some serious size.
I ran Thor's 3 tapes to filter different sizes and I remember debating between filtering out darkpools out of the <100 share tape and just filtering out all 1 share trades entirely. As I can't see what I did now, if you did go the darkpool out of the small tape option then you can add the exchange to your T&S and then there's an option to turn off the abbreviation somewhere, that should tell you which one of those is the one you need to filter. Definitely wouldn't go for filtering darkpools if you only run one tape though.