Wayland
Resources for Wayland Window Management.
How to make sure an application is not XWayland
Install Xeyes, one of the X11 demo apps if the eyes are moving when you mouse over the app, it's X and running on XWayland, as X is giving it access to all of your information. Otherwise, you know it's just wayland.
Resources
Wayland book, the comprehensive guide to using Wayland.
Fixing screensharing on wayland
share with wayland package loopback device for screen sharing smithay: a tool for Rust wayland compositor development control video devices like a webcam