How do I rotate furniture in Sims 4 on Mac?

@MissLajsen  The < and > keys are supposed to work with both the Sims 4 and Sims 3 cameras, in any language.  However, I can see a few comments about that not working with certain keyboard layouts.  Those comments unfortunately don't say what the answer is, other than switching keyboard layouts.  So you might have to experiment a bit—try a few different keys and see what happens.

The easiest thing to do is switch to the Sims 3 camera and test.  To see the option, click on the camera icon in the upper right corner of your screen.  Try both the < and > keys and dragging the cursor while holding an object.  You can also hold down the optn (alt) key and drag around the mouse to free rotate if you want more control.

In the Sims 4 camera, holding an object and doing a single right-click should rotate the object 45º, but only in one direction, so you'd usually have to click repeatedly to get the angle you wanted.  But if you don't like the Sims 3 camera, it's a viable alternative.