noun
maximize button
Computing term for the button in a window's title bar that expands the window to fill the screen.
ウィンドウの右上にある最大化ボタンをクリックしてください。
Please click the maximize button in the upper right corner of the window.
Close button; exits the window or application entirely.
Compound of 最大化 (maximization) and ボタン (button), a straightforward calque from English.