Long press the Delta app icon on your home screen to quickly launch a game. You can change whether you'd like the quick-launch options to be your most recently played games or ones you've specifically selected.
Context Menu Previews
This toggles whether Delta will show a preview of a game or save state when long-pressing.
If Delta crashes when long-pressing a game or save state, toggle off Context Menu Previews to ensure the context menu still appears.
Core Settings
This is where you can access any system-specific settings, such as importing Nintendo DS BIOS files.