Work around for Electron.JS Frameless window White Bar Bug After Maximize Cycle main thread custom maximize and restore event handler. main.js/electron.js https://medium.com/@victoraremu/fix-electron-js-frameless-window-white-bar-bug-after-maximize-cycle-fc1c59f4758c

main.js

const {ipcMain} = require('electron');
// to store the restore window screen width and height and position…
let restoreWindowSave;


//...

function createWindow () {
     // Create the browser window logics.
     let win = new BrowserWindow({ width: 800, height: 600 });
	
    // set initial window width, height and positon
    restoreWindowSave = mainWindow.getBounds();

    // custom maximize and unmaximize event handler logics…
    ipcMain.on('custom-maximize', (event, x, y, restoreDetails) => {
      restoreWindowSave = restoreDetails;
      mainWindow.setSize(x,y)
      mainWindow.setPosition(0, 0);
   });
 
  ipcMain.on('custom-restore', (event) => {
    mainWindow.setSize(restoreWindowSave.width, restoreWindowSave.height);
    mainWindow.setPosition(restoreWindowSave.x, restoreWindowSave.y);
  });

  // ...

}

// ...