The ACP is deployed to all PC versions of the game on the 19th of April 2018.
You have two options to access it: you can either start it via the button in the Main Menu or by clicking the button in the upper right corner of the save files overview (Main Menu > Play).
To use the ACP, you will need an existing save file and Uplay PC needs to be in online mode. However, the availability of the ACP does not depend on story progress; you can modify any save file, regardless of your progress.
Applying ACP settings to a save file (hacking the Animus) will create a copy of the save file you selected. This allows you to resume your game unaffected by ACP settings later, if you wish. You'll be able to distinguish the ACP save game from the normal save game by the note Animus Hacked underneath the save file name.
Please note that you will only be able to apply ACP settings to a save file if you have a spare save slot for the copy to be created. The introduction of the ACP increased the total number of available save slots in Assassin's Creed: Origins. If you have no empty save slot, you can free up a slot by deleting a save file.
The game parameters can be accessed by clicking on the Animus Control Panel button. The ACP will open in an overlay. There, you will be able to change numerous parameters, ranging from general to very specific and from character to world related. Most parameters can be changed on the fly. However, parameters marked with an exclamation mark will require a game restart before they can be applied.
You can also select from four presets:
Mad World: Try to survive in this aggressive environment. Stay away from sandstorms!
God Mode: Play the game like a master. Unleash supernatural power on your enemies.
Default: Resets all parameters to default.
You can save any parameter settings you create and save them as your own custom preset. This allows you to also share your settings with others.