As of now, Halo 5: Guardians does not officially support mouse and keyboard on Xbox consoles. The game was designed and optimized for gameplay with a controller. However, there are some workarounds and third-party devices that can enable you to use a mouse and keyboard with your Xbox console.
One option is to use a XIM Apex or a similar device, which allows you to connect a mouse and keyboard to your Xbox console and translate their inputs into controller inputs. This can provide a mouse and keyboard experience, but it is important to note that it may not be as seamless or accurate as playing on a PC.
Another option is to stream your Xbox gameplay to a PC using the Xbox Console Companion app or a third-party streaming software. Once you have your Xbox gameplay on your PC, you can use a mouse and keyboard to control the game. This method requires a stable internet connection and may introduce some latency, but it can be a viable option for those who prefer mouse and keyboard controls.
It’s worth mentioning that official mouse and keyboard support for Xbox consoles was introduced in 2018, but its implementation is up to individual game developers. While some games, such as Fortnite and Warframe, have added native mouse and keyboard support, others, including Halo 5, have not yet done so.
While Halo 5: Guardians does not officially support mouse and keyboard on Xbox consoles, there are some workarounds and third-party devices that can enable you to use a mouse and keyboard with your Xbox console. However, it is important to note that these methods may not provide the same level of accuracy and responsiveness as playing on a PC.