I installed the newest Opera (64.0.3417.61) and problem disappeared for now. If wont help I'll make test. Thank You

I dont have Bitdefender, Sandboxie and IDM - actually I dont know even whats this

Im testing...

Well, the problem is that I do not play anything,
I don't have a connected monitor/s
I am the only user
I don't change the resolution
I am testing the opera closing properly,
the system is clean, formatted at the end of December
I have a new computer, updated Windows 10
I reinstalled a new stable opera clean (v 67)
and once in 10 times the opera opens minimized
I do not know why!!!?

Well, the problem is that I do not play anything,
I don't have a connected monitor/s
I am the only user
I don't change the resolution
I am testing the opera closing properly,
the system is clean, formatted at the end of December
I have a new computer, updated Windows 10
I reinstalled a new stable opera clean (v 67)
and once in 10 times the opera opens minimized
I do not know why!!!?

It doesnt works

Im testing...

I dont have Bitdefender, Sandboxie and IDM - actually I dont know even whats this

That's understandable since Opera doesn't get to shut down properly. - OK, but what about closing Opera without shutdown computer when I close it properly? (Win 10) It doesnt remember that should open in maximalize window. (Why?)

Just make sure the node type of "windows_placement" is "object", the node type of "height", "left", "top", and "width" are "integer", and "maximized" is "boolean". - Everything is what You wrote.

I know but I used stable version and problem was the same. Ive got problem with it since a few years.

Im testing without extensions.

I have noticed that Ive got a problem with Opera maximalized when I dont close it before restart / shut down of my computer and sometimes when I close and then open Opera during usying computer (Without shut down the computer)

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Unfortunately - I already know that is not working

So If it looks like on my screenshot should be ok? (Im talking about every single line on right side of panel as well)

I dont have multiple desktops, displays, but I have a few extensions (A few Downloaders, Bookmarks by the side and Opera Ad Blocker - thats all!)

It is very complicated - because of this I changed my computer. (I had Lenovo Y550P with Windows 7, now Lenovo Y530 with Windows 10 but problem still exists on every new version of Opera)

Is it this? https://www.solidfiles.com/v/BR2aDyvXwBMQ8

I couldnt find Under root/browser/window_placement, make sure there's a maximized node of type "boolean" with a value of true. If the node isn't there, create it. If it's there, but set to false, set it to true. Save your changes.

Ive got something like this: https://www.solidfiles.com/v/ABG2M3wZ4YpP7

Posiadam wersję 68