@mbadx4
Try this:
- Go into your Applications folder, right (secondary) click on the Sims 4 game and select Copy "The Sims 4"
- Open your external drive in a Finder window and right click and paste the copy of the game. This may take a while as it could be very large depending on how many packs you have installed
- Open Origin, hover your cursor over your name in the bottom left corner and click on Application Settings in the pop up menu
- Click on Installs & Saves > Game Library Location in the main Origin window and click on Change Folder
- Navigate to where you pasted the copy of the game and click Open
- Delete any shortcuts you have to the game on your Desktop, Dock or elsewhere.
- Launch the game to check it is working. If it launches ok, trash the original Sims 4 game from your Applications folder.
- Launch the game again to check it is working and successfully reading the new location on your external drive
As Tremayne has pointed out, your user data (saves, screenshots, tray items etc.) is stored in Documents > Electronic Arts > The Sims 4 and this cannot be changed. Make a back up of this as a precaution before trying the steps above 🙂
