Somehow my Opera navigation bar disappears by not changing a setting nor downloaded any extension. I tried to find something in settings but couldn't find anything related to navigation bar. Is this new feature?
The sidebar? Being able to pin that so it was always visible is new in 45, before that it only showed when one of Opera's internal pages was displayed and was part of the page. If you're in fullscreen mode (can't see the address bar) then it makes sense to hide the sidebar too - if you're showing a regular web page. If you're showing Speed Dial or another internal page then it's somewhat inconvenient.
I'm not a Mac user, but I see the same thing in Windows so I'll file a bug report on it. Okay, DNA-61420. (Of course you can just leave fullscreen mode to get it back, but I agree it should be better.)
Hi @verpag, you're not the only one, but so far I haven't seen how it happens
You can get it back like this: click View -> Show Toolbar in Full Screen Mode in the menu.