const windowTitleBar = require('electron-windows-titlebar');
const win = new BrowserWindow({
  width: 800,
  height: 600,
  title: 'addon demo',
})
const hwnd = win?.getNativeWindowHandle();
const setDark = true;
if (hwnd) {
  setDark ? windowTitleBar.switchDarkMode(hwnd) : windowTitleBar.switchLightMode(hwnd);
}

// renderer process: import electron-windows-titlebar renderer
import TitleBar from 'electron-windows-titlebar/TitleBar';

<TitleBar
/>