Cursor disappears from external monitor on 10.13.4 update
Since updating macOS to 10.13.4 my cursor disappears on my external monitor.
A temporary fix is to increase the cursor size in System Preferences > Accessibility > Display > Cursor Size.
I'm on a MacBook Pro 13-inch 2017, Two Thunderbolt 3 port laptop.
MacBook Pro with Retina display, macOS High Sierra (10.13.4)