To get aim assist in Fortnite, you simply have to switch it on in the game’s settings menu. To find aim assist in settings, first open the sidebar, then select the icon that looks like a menu overlapping a cog, then select Settings from the menu.
Now go to the Controller Options tab, which is labeled with an icon on a game controller overlapping a cog, and go down to the Sensitivity section. There, set Use Advanced Options to On.
Under Advanced – Sensitivity, set Aim Assist Strength to 100%. If
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