Until Opera 60.0.3255.27 the behavior was as expected: You "minimize" Opera with the red button and it will be (active) in the dock. Click the Opera-Icon in the dock again and it will open instantly a new window. That's what I want. With the latest Opera ..... .65 a click on the (active) Opera-Icon in the dock causes... nothing. The Opera app appears in the menu bar without a new window, you have to click inconvenient "Open a new window" or "Open a new tab" in the (context)- menu.
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RE: [Solved]Minimized Opera won't restoreOpera for Mac
RE: Oversized thumbnails in speeddial after update to Opera 69Opera for computers
Normal when choosing, overlapping in Speed Dial, no matter if small or big
RE: Is there a way to stop speed dial tiles from shifting their order?Opera for Mac
Sorry, this won't help you, but I never had this problem with Opera. My speed dial tiles are always in the same order I wanted and never shifted. It must be some preference that not works well.
[Solved]Minimized Opera won't restoreOpera for Mac
Updated to the latest Opera build and noticed, that Opera will not restore to a window, when it was minimized with the red button (macOS 10.14.4).
That's annoying. I had to minimize it with the yellow button....