@henrih You can try going to opea://bookmarks and remove the extra devices in Other Speed Dials, but you probably will need to reset your synced data to get out of those devices.
@tidus Some extension perhaps? Opera wouldn't be sending images to Google on its own. And why in Synchronization - this forum is about synchronizing Opera on multiple computers/devices and not Google. What platform are you having this issue on? (Windows 10 PC, Android phone or tablet, etc.)
@popiomondayz Opened tabs are synced in Opera for desktops and Opera for Android.
To see your opened tabs in other installations in Opera for desktops click on the tabs button in the sidebar.
@lavanyadeepak-0 Both are user friendly. One encrypts only the passwords and the other encrypts all synced data.
If you change your Opera account password, you probably will be prompted to provide the old password in order for your synced saved passwords to be decrypted.