This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
The joystick on a game controller input will take focus away from what you're working on if the joystick is moved or set in an odd position.
1. Open up any new template
2. Open up a blueprint
3. Plug in an Xbox Controller
4. Hold down the left joystick
5. While holding down the left joystick, try to click on an editable option in details
Result: The joystick keeps you from being able to input in the field you're clicking on.
Expected: Joystick not to respond outside of the game.
Head over to the existing Questions & Answers thread and let us know what's up.