I am unable to invoke the LibreOffice Help - not via Help -> LibreOffice Help (F1) and also not via any Help button I have tested. The browser is started but showes only an empty white page.
My workaround: Within browser
Disadvantage: No context sensitivity
Steps to Reproduce:
Help -> LibreOffice Help (F1)
Empty white browser page
LibreOffice 6.2 Help
User Profile Reset: No
Build ID: 98c6a8a1c6c7b144ce3cc729e34964b47ce25d62
CPU threads: 2; OS: Mac OS X 10.11.6; UI render: default; VCL: osx;
Locale: de-DE (de.UTF-8); UI-Language: en-US
Thanks for reporting this issue.
It seems like a duplicate of bug 121532
*** This bug has been marked as a duplicate of bug 121532 ***