egui/egui_demo_app/src/main.rs

#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release

// When compiling natively:
fn main() {
    // Log to stdout (if you run with `RUST_LOG=debug`).
    tracing_subscriber::fmt::init();

    let options = eframe::NativeOptions {
        // Let's show off that we support transparent windows
        transparent: true,
        drag_and_drop_support: true,
        ..Default::default()
    };
    eframe::run_native(
        "egui demo app",
        options,
        Box::new(|cc| Box::new(egui_demo_lib::WrapApp::new(cc))),
    );
}