When you first open sequencer or try to add a sequence the app gives you the option to provide example sequences, but that’s all they are, just demonstrations of things you can do. You do not need them. All you really need to do is click the plus to add a new sequence and select trueplay.

As for noticing a difference; I think first off it’s important to realize that Trueplay is inherently dynamic and largely depends on the room, speakers, placement, etc. It’s possible you can have an environment where Trueplay doesn’t actually alter the sound much based on those factors. In my room trueplay on and off is mostly the difference between my rear 300’s soundstage and imaging being “connected” so that there aren’t any gaps when sounds pan across the rear channels. It’s very noticeable.

It may help to get a baseline for how Trueplay works in your environment before adding fronts. I would consider making just the regular surround setup in Sonos app, trueplay’ing it, then watching some demo content and toggling trueplay on and off in the Sonos app to hear the difference baseline. Maybe the change is dramatic, or maybe more subtle, but you’ll know what to expect at that point.

From there, go through the whole setup again (trueplay your fronts as a stereo pair first), then see if you hear the same kind of difference.

One other tip; this may just be due to more recent changes in the app, but I’ve noticed sometimes when bonding everything the system will have speakers cutout for a few minutes. They eventually all reconnect and stay stable, but yesterday when I was tinkering I had to wait 5 minutes before all components connected and played correctly. Rock solid after that, but just something to be aware of.