Disable Caddy Controls (Global Fix – Recommended)
This restores the classic dialog boxes for Chamfer, Bevel, Inset, etc.
- Go to Customize → Preferences
- Open the General tab
- Find Caddy Controls
- Uncheck: ✅ Use Caddy Controls
- Click OK
- Restart 3ds Max (important)
After restarting:
- Chamfer → classic dialog
- Bevel → classic dialog
- Inset / Extrude → classic dialog