This bit is an Ableton Live tutorial on organizing automation in Arrangement View using dedicated Automation Lanes, giving each parameter its own visible track instead of stacking everything into one cluttered view. It shows two ways to add a lane: pick a device from the Device Chooser and click the plus icon next to a parameter, or simply click that parameter anywhere in Live's interface to have the track display it automatically.
Once you've got multiple lanes going, the arrow button lets you fold or unfold them, so you can collapse what you're not working on and keep your arrangement readable even when several parameters are automated at once. It's a small workflow habit that pays off fast once a track has more than one or two automated parameters running at the same time.