Offtopic, but this is not understandable. Windows broadcasts shutdown or logoff messages and applications should be able close itself properly (well, within some predefined time span).

Correct. I just meant that it's understandable for Opera as it's been known to not fair well in that situation.

That's understandable since Opera doesn't get to shut down properly.

Offtopic, but this is not understandable. Windows broadcasts shutdown or logoff messages and applications should be able close itself properly (well, within some predefined time span). Not that many programs do - I usually close most of my open programs manually to avoid any problems.

@Operes
Are you using programs (like games), which may change screen resolution or do you switch users (also can change screen resolution)? Or do you use more than one monitor sometimes?
Opera may not like such environment changes (many other programs do not) and may write some strange info into configuration and next time be not able to use it.

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?)

Not sure. It's working fine for me and we've tested that the setting is saved properly. You tested in a standalone installation (which gives you a fresh profile to rule out problems with your profile), and it still does it. So, I doubt that it's an issue with your profile. Maybe there's some external program that interferes with Opera. Bitdefender, Sandboxie and IDM have been known to mess with Opera.

I have noticed that Ive got a problem with Opera maximalized when I dont close it before restart / shut down of my computer

That's understandable since Opera doesn't get to shut down properly.

and sometimes when I close and then open Opera during usying computer (Without shut down the computer)

Not sure. Works fine here on Windows 10.

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

o If it looks like on my screenshot should be ok?

Yes.

Im talking about every single line on right side of panel as well

Root is selected, so the panel on the right just shows the properties of "root".

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".

Note that the version you're using is Opera Beta and not Opera Stable.

Also, do a test. Download the Opera installer (of whatever version of Opera you want to use), launch it, click "options", set "install path" to a folder named "Opera Test" on your desktop, set "install for" to "standalone installation", uncheck "import data from default browser" and install.

Test in that Opera, but do not enable Opera Sync and do not install any extensions.

How does that Opera work. When you close it maximized, does it open maximized?

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)

Try disabling all your extensions too.

Do you have multiple desktops and or multiple displays?

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

Click the + next to "Browser" to expand it.

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

Open the "Preferences" file in the profile folder with JSONedit.

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.

If that doesn't fix the issue, then it's probably some extension you have or something outside of Opera that's cause the issue.

You can try loading Opera by directly double-left-click on its launcher.exe in the install folder. Or, try it with opera.exe in the version folder in the install folder. If things work fine there, the properties of the shortcut you're using to launch Opera need to be fixed.