Newest example I've seen is SF6, your options are windowed or windowed borderless. Hogwarts legacy also does the same. Why the hell is this?
btw alt+enter doesn't work
I hate it because it means I have to alt tab when I want to pause a video on a secondary monitor. I also thought the common wisdom was that fullscreen mode yields the best performance and lowest latency. Is this no longer true?
As far as performance goes, I don't think there is much difference
In fullscreen mode, resources are dedicated to rendering just that game. In windowed mode, resources are being used to render the desktop, etc. Think of fullscreen mode as a sort of "exclusive access" mode of the GPU.
Also, in windowed mode, there will almost always be more input lag, as Windows forces triple buffering (last I checked) in windowed mode.
Other benefits of fullscreen gaming include:
preventing the cursor from moving to a second monitor and leaving the game