Method 1: Set via Steam

Right-click on Grand Theft Auto V (GTA 5) in your Steam library, select Properties, go to the General tab, and under Launch Options, enter the following command:

-nobattleye, Make sure there is a space before the command if you already have other launch options.

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Method 2: Set via Rockstar Games Launcher

Open the Rockstar Games Launcher, go to Settings > Launcher, and uncheck the option for BattlEye Anti-Cheat.

After completing the settings, restart the game. Once you've entered the game, click Apply a BUFF in the GameBuff software to make in-game modifications.