Recently I reset my Opera Sync setup (by resetting passphrase, which removed all existing devices and synced settings/elements) and re-setup sync from both Opera and Opera GX browsers (both browsers are installed on the same device, Windows 10 PC).

I quickly noticed that my Opera GX browser (which was second one to be added/setup for sync) adopted common settings from the existing settings that I already setup and synced for Opera Standard. This is excellent and I see no issues here, as a matter of fact I am delighted to see this feature in place and working.

As I monitored the process I noticed that the number of synced settings (as listed at Opera Sync site) increased, so I am assuming that there are common settings and then there are browser version/type specific settings (like settings for Standard or GX only), again no problems here.

As I decided to adjust some settings in one browser I noticed that the other browser almost immediately reflected the new settings, pulling them from the new synced version....

So, this is the point at which I am seeking assistance. Specifically I would like to know how is the settings synchronisation processed/prioritised.

For example:

What happens if I add new device/browser to the sync process, will the sync service force existing settings on the newly added device/browser or will it replace the settings stored online with these from the new device?

What dictates which settings (the ones online or the ones in the browser) are considered as active/principal and overwrite all others?

I am asking this because I do not want to be in a situation where I am reviewing all settings on all devices/browsers instances every time after I add new device/browser instance to the sync.

Your assistance in this matter is much appreciated...

Kind Regards
Daniel