How can I use my touchpad to rotate my camera horizontally?

Edit:  Rather than trying to remember what this was like the last time I used a touchpad in Windows, I booted up the game to try.

@summerlyss  Hold down the crtl key, and right-click and drag in the direction you want the camera to rotate.  In Sims 4 camera mode, this will only rotate horizontally; in Sims 3 camera mode, you can change the camera angle in any direction.  Click the camera icon in the upper right corner to switch between the two modes.