Google first introduced the new Gmail compose window last October. Users were encouraged to try out the new "compose experience," with the option to revert to the old compose method. Just a couple of weeks ago, Google announced that the new compose would now be the default and that it'd be rolled out to all users.
If the new compose window feels a bit cramped to you, we've got a tip that'll let you stretch it out a little while composing your e-mails. Instead of being stuck to the inside of your browser, you can launch a resizable pop-up Gmail compose window.
To launch the pop-up compose window, hold down the Shift key on your keyboard while you click on the compose button. This also works when you click on the reply button.