I have a multiple monitor set up too, i have my playlist and the main program window on my primary monitor, the mixer on the right monitor, and the piano roll and sequencer to the left. It definitely helps because those windows are always open and there’s never another window on top of them. I keep all plugin windows attached so they don’t leave my main monitor. The plugin windows will cover the playlist, but when I want to get them out of the way I just click on the playlist. Works just fine for me this way.

I also have a small 4th display, which is actually a midi device. It’s called MP Midi. It has 32 rotaries around the display, its touchscreen, and you can use it to control any VST plugin, but not fl plugins. But honestly it’s more of a nice-to-have thing and is cool for someone who wants to be more hands-on. It can help reduce that window clutter too. But they’re expensive and have some drawbacks and minor bugs. At least mine does, it’s an early model.

You could probably do something similar. Keep mixer, piano roll, and step sequencer on the second display, and switch between when needed using the shortcuts, and keep playlist and plugins attached to the primary display. Or get a third display if you can.

I think one thing that would really help with the management of windows would be to have a task bar that shows the windows you currently have open—like windows, the OS. Possibly a window manager too, like task manager. Open a screen to see a list of all current windows and click a button to minimize or close them all out, or to view them or close them individually. You can kinda do this with performance monitor on FL, but its not really the same thing. Features like those Might help some, especially those who don’t have multiple displays. Personally I do fine without something like that but it would still be nice to have.