The box that the frequencies are displaying in is the channel activity log. The mode that hides traffic that is below the current monitoring threshold only applies to the event log, not the channel activity log. as described in @
BM82557 post
It's pretty easy.
I have a ton of tg's set to 90 and there enc. I took my important stuff and set it for 55 to about 80 depending on who and what I want to hear. As long as I stay under 89, I do not get any of those unwanted tg's showing in the event log.. I used to drop down to 50 to catch new tg's or patches on the system when I would go out or overnight but the last seen groups window takes care of that. Plus I have Unitrunker recording 24/7.