Where is opera's minimize button?

Question

Opera

I installed it for the first time in my life, and was immediately surprised, where is the button to minimize the window? Or rather, when I expand opera to full screen, there is no minimize button, if I minimize the window, there are buttons.
But all this is not very convenient for me, how can I make the buttons always be there?
To make it clearer:
This is what the window looks like in full screen (no buttons):

And here is the minimized version:

Answer 1

Is this Gnome 3? If yes, then you need to enable the display of the title for maximized windows. The title will be like the minimized windows.