To get aim assist in Fortnite, you have to switch it on in the game’s settings menu. To find aim assist in settings, first open the sidebar, select the icon that looks like a menu overlapping a cog, and select Settings from the menu. 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 it’s already at 100%, you already have aim assist, and you can’t make it any stronger. If you want to turn it off, you can set that same setting to 0%.
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Aim assist automatically pulls your crosshair towards nearby enemies to some degree without you having to aim manually. If it doesn’t feel as strong as it used to, that’s because Epic Games has weakened it when using certain weapons in certain situations, in particular when using automatic weapons in close quarters. Aim assist is still in Fortnite; it’s just being tweaked to better balance the game. Whether or not the tweaks are improving matters or not is a matter of opinion.