All this is in Settings:
- Account > Manage account
- Account > Choose what to sync > Uncheck all but Bookmarks
- Search > DuckDuckGo
- Tabs > Close after one day
- Homepage > Shortcuts > Turn off all
- Homepage > Wallpapers > Select one
- Homepage > Opening screen > Homepage
- Customize > Theme > Dark
- Customize > Toolbar > Top
- Logins and Passwords > Turn off all (including "Save passwords")
- Autofill > Turn off all
- Set as default browser > On
- Data collection > Turn off all, including Studies
- Delete browing data on quit > Off (Uncheck all but Tabs)
- Add ons > uBlock Origin, Bitwarden