I have a Mac Air. I use the mail application all the time.. The red, yellow, and green buttons disappeared at the top of screen... now i have to force quit mail.. how do it get the buttons back?

I have a Mac Air. I use the mail application al the time. THe red, yellow, and green buttons disappeard. i have to force-quit now to close mail.. How do i get the buttons back? thanks.

Mail window may be in the Full Screen mode.
Move the mouse pointer to the top right corner of the Mail window and hold it there.
Menu bar should drop down and click the blue double arrow icon.
Full Screen toggle shortcut:  control + command + F

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