Brave 22.214.171.124 on MacOS 10.15.1
This link from the Brave community gives instructions on using these commands to set Brave to open in incognito mode by default:
defaults write com.brave.Browser IncognitoModeAvailability -integer 2
However, Brave crashes when calling the About or Preferences items from the Brave menu. The only workaround I’ve found is to reset the integer in the above command to run in the less-secure, non-incognito mode by default.
How to see About or Preferences pages in incognito mode?