I've spent some time adjusting to Windows 11's Action Center too, and I totally get where you're coming from. The first thing to notice is that Windows 11 has split the Action Center into two separate areas: Quick Settings and Notifications.
For customizing Quick Settings, you can access it by clicking the network, volume, or battery icon in the taskbar. Once there, you can rearrange or remove buttons by clicking the pencil icon. You can also add other settings like Night Light or Focus Assist by selecting the "Add" button.
Notifications, on the other hand, are accessed by clicking the date and time on the taskbar. One feature I appreciate is how notifications are grouped by app, making it easier to manage them. If you want to customize how you're notified, you can go to Settings > System > Notifications. Here, you can tweak settings like priority notifications, which can be really useful for minimizing distractions.
A shortcut I often use is pressing Win + A to directly open Quick Settings. For any potential bugs, I've noticed users mentioning that sometimes notifications don't clear properly. If you experience this, restarting explorer.exe through Task Manager can be a temporary fix.
In terms of advice, keep an eye out for updates as Microsoft tends to roll out fixes pretty quickly. Do you have any specific notifications or settings you find tricky to manage? I'd be happy to delve deeper into those if needed!
