@kuro225 "Instructions on posting about problems in Opera GX", https://forums.opera.com/topic/39910/instructions-on-posting-about-problems-in-opera-gx/2
... And from there, "Create a clean profile folder/directory", https://forums.opera.com/topic/23336/frequently-asked-questions/5
++
"Backup and Transfer Opera Settings, Profiles, Browsing and Passwords", 3rd-party website, no affiliated with Opera:
https://www.reddit.com/r/operabrowser/comments/d7lsmc/backup_and_transfer_opera_settings_profiles/