No offense, but are you really still using this browser? Or a better question: have you even tried to do what you mention?
Because: Site configuration? What's that?
I don't think you even know what you're talking about...
- Block Ads.
- Wallpapers
- Appearance
- Quick access
- Sidebar
- Synchronization
- Search engine
- Default browser
- On Startup
- Privacy and Security
- Passwords and forms
- WebRTC
- VPN
- Battery saver
- Instant search
- My flow
- Search pop-up
- Video pop out
- Personal news
- Opera turbo
- Start page
- User interface
- Languages
- Downloads
- System
- Shortcuts
- Reset settings
So where is this magical setting you're talking about? If mods can't even find it.. sorry, I'm losing faith here.