Good morning, Ed,
I just tried something out, maybe it will help to explain what I’m experiencing.
I opened a new project of the Third Person template.
Without modifying anything, when I click Mobile Preview, the first thing the mouse does is control the camera. When you click, it sort of “wakes up” the joysticks (and if that doesn’t work, you may have to hit Ctrl while left-clicking), and you can sometimes select them, but it’s nearly impossible to do without seeing where your mouse is. When you do finally select one, the entire joystick will often get dragged to a new location instead of staying anchored in place. Eventually it will bounce back to its starting position after enough clicking. (To be fair, this unusual jumping behavior was exhibited even in the tutorial to some extent, so it’s likely that the bug has existed at least since 4.8.)
Nevertheless, your helpful tip is a total lifesaver, as now I’m able to see where the mouse is clicking, which is great. I’m still not able to hit Shift-F1 to regain mouse control to close the window, but at least it’s much easier to control the character.
However, in the tutorial from 13:16 onward, you will see that the instructor is able to use Shift-F1 to regain mouse control to also see where he’s clicking.
I hope this helps… and sorry if I’m missing something obvious, as I’m still extremely new to Unreal Engine. I’m really thankful for what all of you at Epic Games have made Unreal Engine into… it’s a real pleasure to learn the software, and the wealth of training resources you’ve provided is invaluable. 