OK, problem is solved for me.
I opened Opera, windows setting panel showed up, like always.
I change default browser to Edge and default mail program to Mail.
Then I closed Opera, opened it again and setting panel did not showed up!
So I closed Opera, opened Windows setting by myself and changed Opera to my default browser.
And everything works.
I'm quite sure I tried this before, so maybe some magic is involved.
I hope I helped somebody.