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.

Normal when choosing, overlapping in Speed Dial, no matter if small or big

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.

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....
Anyone else?

Newest version Opera 60.....70. Still the same bugs.
BTW: Do Opera developers sometimes visit this forum?

Here no problem to open your linked page. The graphics are visible and the map is zoomable. No pop-up window.
macOs Catalina 10.15.7, Opera 72.0.3815.148

I have never experienced anything like this before. How about a good adblocker...?

I don't know exactly what the problem is, but under "Opera" "Display" you have the item "Show sidebar". If activated, you have the narrow sidebar with vertical buttons, not activated the normal horizontal buttons (Opera 70.0.3728.106).

Unfortunately I can't say anything about it, because I had always deactivated DOH. But I suppose that this is a bug in the latest version or it " gets stuck " with other settings. I would wait for the next update. Can't take too long.

Why DOH at all? I deactivated DOH in the browser and set Cloudflare (1.1.1.1 etc.) directly in the router as DNS server. No problems (Opera 70).

Like I said, I see the problem, but I'm not too concerned with it right now: I try to load the original favicons/icons of the page. Not always succeeds, but often. Only pages that don't have their own icon get the standard icon. I can live with that. Of course the fact that it is a bug remains.

Normal when choosing, overlapping in Speed Dial, no matter if small or big

Same here, but that's not gonna make me sweat. Whenever possible I use the website icon itself anyway.

Are you sure? It's true that when you type in the address bar in private mode, search suggestions are shown, but these are not from private mode, they are suggestions from normal mode use. Searches in private mode are never saved. At least a test at my end showed this. Of course it would be nicer if no search suggestions were shown in private mode.

Deactivate the sidebar!