Riot Arkem, a lot of people have been saying that this driver on startup should be toggleable for when the game is not running. How do you feel about this? Is it possible we could get this?
We'll look into it, we might be able to make a toggle.
In the mean time you can toggle it manually via the uninstall process. You can uninstall Vanguard separately from the game and reinstall it when you'd like to play again.
Details on how to uninstall Vanguard are here: https://support-valorant.riotgames.com/hc/en-us/articles/360044648213-Uninstalling-Riot-Vanguard