Compose email messages from Gmail in a new window / full screen
By default, when you compose an email message from Gmail, reply to an email, or forward one, the email editor will open in the same browser window as your inbox. But Gmail lets you optionally type these emails in a new, separate window, and you can even compose your Gmail emails in full screen thanks to this feature. We will explain how to do both things in this tutorial; using a separate window like a dialog can be extremely useful if you are sending an email about content inside your web browser or another program (like a Word document you are reviewing, and letter you are reading, etc.)
Open the Gmail editor in a new window
Follow these steps to use a separate window for your blank email, reply, or mail forward:
Once inside your Gmail account, perform the initial action as you usually would ("Reply", "Reply To All", "Forward", or "Compose mail", as the case may be).
When the email editor opens, you will notice a pop-out / popup icon on the right, as shown on the screenshot below:
Click on this button, and Gmail will open the current email message editor inside a new, separate web browser window: your emails and inbox stay where they are, and no other browser tabs are affected, but the email you were about to compose now stands free, inside its own window - that contains only the text editor, send button, etc:
Note that, just like any other window, the separate Gmail editor window can be resized, minimized, maximized, etc.
This is how you can send emails from a new window inside Gmail; to have more room to edit your email message, or to block any distraction and concentrate on your email, you can now view it full screen.
Press the F11 key on your keyboard, which will work in Internet Explorer, Firefox, Google Chrome, and the Opera browser (check your web browser's documentation if this key doesn't show your email message in full screen mode). Now, your entire screen is devoted to the task at hand, and you can concentrate on what you want to say.
When you are done, click on the "Send" button, and Gmail will email your reply to its recipients, and close this new window after a few seconds, and having shown a "Your email has been sent" confirmation message.