I've used Vegas for several years producing various videos, nothing too complicated. However I kinda rusty not having edited a video for three years and now I'm editing my youngest sons wedding and I enabled something I need to undo.

Regarding the control panel for each track, I will mute a particular track to see which audio or clip I prefer. Somehow I've turned on an option that when I mute any single track, all the tracks get selected, meaning I can't isolate individual ones any more. What have I done?
Thanks