How to use Systems Manager - Fleet Manager across an AWS Organization

I'm guessing I just need to keep digging into this more, but it feels very complicated to get Systems Manager up and going. Between the different Quick Setup configurations and/or enabling the various OpsData sources it seems overly confusing but maybe it needs to be.

But what I'd like to do seems straightforward, at least on the surface; I'd like to use the Node Manager functions, initially Fleet Manager across my whole Organization. I see the nodes when I'm in the individual accounts; I would just like a way to see them across the Organization in the main account or the account I've delagated.

Anyway, if I'm missing something straightforward on how to do that please let me know. Otherwise I'll keep digging and trying things.