How do I rotate objects in build mode on The Sims 4 for Mac?

If you need to rotate objects on Build/Buy mode, you can use either your mouse or keyboard.

To rotate using your mouse on Mac:

1. Open Build Mode.
2. Select the object you want to place. 
3. With the object selected, click the right mouse button.
4. Now press the right key on your keyboard to rotate the object 45°.
5. Click the left mouse button to place the object.
   
   

To rotate using your keyboard on Mac:

1. Open Build Mode.
2. Select the object you want to place. 
3. With the object selected, use the period key to rotate clockwise, or the comma key to rotate anti-clockwise. This will rotate the object 45°.
4. Click the left mouse button to place the object. 
   
   

You can also rotate objects freely without snapping them to the grid using your mouse:

1. Open Build Mode.
2. Select the object you want to place. 
3. Using the mouse, left-click and hold the object.
4. Hold down the ALT key as you move the mouse, turning the object.
5. Let go of the left mouse button when the object is facing the direction you want.
   
   

For full details on rotating items, see the Official EA Guide: Rotate Objects in The Sims 4.