Click Channels on the left side bar. It’ll show you what channels are what.
Left-click on the channel you want to move, and drag it to the position you want it to be. If it’s TRP or one of those, it’s likely a broadcast channel to communicate with others who share the add-on. You may just need to drag it to the bottom of your list, and everything else will be corrected.
Yup! I don’t know when that was implemented, but when I roll new characters, I always have to fix my channels due to the add-on broadcast channel throwing everything out of whack. Used to be convoluted leaving and rejoining to get everything like I like it, but you can drag the channels now!