@burnout426 In Opera for Mac (Sequoia 15.0.1) I didn't find an "exit" option - I just closed the application.
There is no Login option in the keychain. I found the Opera account login and an additional login - login via AppleID.
After removing both options, I tried to log into my account (Opera remembers the password), but unfortunately the problem remains unresolved.

@Cessaar
Interestingly, restarting the Mac did not close the open pages. But closing Opera causes it to run without them.

@burnout426 In Opera for Mac (Sequoia 15.0.1) I didn't find an "exit" option - I just closed the application.
There is no Login option in the keychain. I found the Opera account login and an additional login - login via AppleID.
After removing both options, I tried to log into my account (Opera remembers the password), but unfortunately the problem remains unresolved.

@leocg unfortunately it doesn't work. Previously, on Win10 it worked without any problems. I've had this problem since I've been working on a Mac.

@leocg
Option "Keep your cards from the previous session" doesn't work