Can you run a simple label test with your customer base?
Default is often used when referring to an applications settings (i.e. choosing which program opens an image, which web browser to open by default). Things are reset to a default, or 'use default settings'.
It sounds like they aren't technical users, but if they've used iOS, windows, and setting up email (many tasks), the word default comes up rather frequently in relation to Settings.
NOTE: 'Default' does have one negative connotation; in the mortgage industry, a loan in default is not good at all!
In terms of computer science:
Computers. a value that a program or operating system assumes, or a course of action that a program or operating system will take, when the user or programmer specifies no overriding value or action.
'Basic' (and sometimes standard) is often used when referring to subscriptions and memberships; things that a customer does to or decrease a relationship with a vendor. It assumes increasing capacity of current features, or unlocking new features. I haven't seen instances of 'default' (If anyone has examples, please post) i.e.
'Basic' implies a limited set of features or functionality.
Is changing settings for your app unlocking more functionality and complexity? Or is it more like making a theme, where they create and name a subset of preferences?
If you can provide more context, I'll update my answer; I'm running on the info you've provided.