I finally discovered how to do a pinch-zoom on the Android emulator for Android Studio 3.2. This was hard to find, but hope it helps someone.
- move your mouse to where you want the centre of the pinch zoom. (do NOT press the mouse button)
- press SHIFT (do not press the mouse button)
- press Command (do not press the mouse button)
- you should see a round target under your mouse (you haven’t pressed the mouse button yet, have you)
- move your mouse away from this first location to where you want your second “finger”
- now you can press/drag your mouse to do the pinch/zoom
That was easy – or not.