Several applications are popular for automating sensitivity or aim assistance:

Most professional players avoid macros and instead use optimized sensitivity settings to hit "only red" shots. High general sensitivity (close to 100) is key for fast drag speed. Download - Macro Sensi Max APK for Android

Garena, the developer of Free Fire, regularly updates its anti-cheat systems. Even if a macro is currently undetectable, a future update could flag the account, leading to a permanent ban.

"¡Todo Rojo en Free Fire con este Macro!"