I don't know why you did it, but a quick flick up to the corner of the screen to close an app no longer applied in Opera, you changed the style... now it's highly annoying to close, I think every other app I've ever used since the 90's I've closed in a similar way on Windows, it's making me want to go back to Firefox, well I actually use Edge as my main browser, but I was simply using Opera to avoid using Youtube on Firefox, anyway... If it's at all possible to let me know how to remove the rounded off X close button in the top right hand corner this would be a boon... otherwise it's got to go.

I don't know why you did it, but a quick flick up to the corner of the screen to close an app no longer applied in Opera, you changed the style... now it's highly annoying to close, I think every other app I've ever used since the 90's I've closed in a similar way on Windows, it's making me want to go back to Firefox, well I actually use Edge as my main browser, but I was simply using Opera to avoid using Youtube on Firefox, anyway... If it's at all possible to let me know how to remove the rounded off X close button in the top right hand corner this would be a boon... otherwise it's got to go.