@domo That's not a "Wayland question", that's "<your DE> question".
On Plasma, there's `kscreen-doctor`.
On Phosh, Sway, Wayfire and some others, there's `wlr-randr`.
On GNOME I don't think there's a tool supplied, but there's at least Mutter's DBus API that can be utilized: https://gitlab.gnome.org/GNOME/mutter/-/blob/main/data/dbus-interfaces/org.gnome.Mutter.DisplayConfig.xml