After a recent update of ChrOpera, pressing Alt+Space no longer gets you the system menu:
This violates not only the Microsoft User Interface Principles, but also the principle of least astonishment and the Americans with Disabilities Act by making it impossible to move the Opera window using only the keyboard.
(Incidentally, this search box also violates explicit user choice by forcing the search engine to be Google)
How to get back the system menu for window management?
Best Answer
You can configure your shortcuts to free the Alt+Space combination in Opera.