In my test setup we have multiple Neos Settings.yaml

Configuration/Settings.yaml (no DB settings)
Configuration/Development/Settings.yaml (yes, has DB settings, but the local ones)
Configuration/Production/Settings.yaml (correct production DB settings)

synco-serve automatically took the ones from the Development/Settings.yaml, which is wrong.
After I deleted them, it took Settings.yaml, not Production/Settings.yaml

It would be nice to have a way to configure synco which environment it should take and optionally that it does merge the corresponding context and sub-context settings.