On Friday Google decided it was time to give Gmail users their full-screen compose window back.
As the rollout of the "new" feature continues, you'll eventually see the icon to expand pop-up compose window. Clicking on it will reveal the full-screen compose window.
Now for the best part: you can set the full-screen window to appear by default going forward. To do just that, click on the More Options arrow in the lower-right corner of the compose window.
From here click on the "Default to full-screen" option, placing a check mark next to the listing. … Read more