That's right, in VLAN profiles, the default profile is the main one, where you can create and manage VLANs and groups. When you create a new profile, it copies everything from the default profile. However, in these non-default profiles, you can only edit the adaptive policy settings.
The main difference between the profiles is the adaptive policy, which allows you to apply different security and traffic management rules based on the profile.
VLAN Profiles - Cisco Meraki Documentation
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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