Before switching to Graphene OS, I came across some comments from users claiming that if you enable the kill switch and use multiple profiles (for example, one profile with Mullvad on and another without), the profile without Mullvad would not be able to connect to the internet due to the kill switch.
This is not true. I just tested it, and everything works fine. The kill switch is enabled only within the profile that has it activated, and it does not affect the other profiles.
I hope someone finds this information useful.