None.
Oxygen is a theme-less page builder. Once activated, it nulls any theme in use:
- The theme’s style and a scripts are not loaded automatically.
- The theme’s functions, hooks, and filters are no longer accessible or executable.
- Elijah Mills Design Sets (included on Oxygen).
- Dezign 4 Fun (Paid).
- Oxy Elements (Paid).
- OxySet (Paid).
- Accelerate by Ukuwi (Paid).