I have a part with multiple configurations. Is there a setting that allows me to add new features to the active configuration, but which are suppressed in all other configurations? Seems like a dumb question but I'm sure it should be clear how important.
In the configuration properties in the Advanced Options section there is a checkbox for "Suppress new features and mates". You need to enable this option for every other configuration. You can enable it in the active configuration too and don't worry it won't automatically suppress new features made in that active config, it will only suppress them in other configs with that setting enabled.