Sharpshooter Focus is a feature in Call of Duty: WWII.
Campaign
Sharpshooter focus is available for any guns in the campaign. It will block out nearby surroundings if the player is using a sniper rifle with 6x Optic. If the player stay in focus for too long, the hold breath bar will be maxed and must be lowered in order to activate Sharpshooter focus again.
Multiplayer
Sharpshooter is a Division Skill for the Mountain division that allows the player, with their default sniper scope, to block out nearby surroundings to acquire aim assist. This allows players unfamiliar with sniping to have an advantage over run-and-gun enemies to take them down easier. The ability is exclusive to sniper rifles with regular scopes.
On April 10th, 2018, Sharpshooter was removed from being a Division Skill of the Mountain Division and became a default attachment for any sniper rifle with the Divisions Overhaul.