Actually the best way is to build the scan lists for only those talkgroups you want to hear. If memory serves, that means running in closed mode (which is similar, if I understand it properly, to Uniden's ID Scan mode). In open mode (similar to Uniden's ID Search mode) you'll hear every talkgroup regardless of whether you want it or not.
The problem with running in open mode is that at some point you're going to hit the limit of how many tgs you can lock. Best to build something to the way you want to hear it
best regards..Mike