Don't make 'improvements' without asking
I was about to compose an email when another window popped up regarding seeing inbox whilst composing. Not fully understanding what it meant, I clicked on something and now can't see the full screen when composing. JUST LEAVE IT ALONE.
Hi there. If you wish to have the full sized Compose window as default, please go to Settings>More Settings> Writing email>select ''Full-sized'' at the Compose window option.