The new check box 'Ignore system input language' in Tools > Options> Language Settings > Languages has no help. There exists neither an extended help text nor a section on the help page, where all the other options of this dialog page are explained.
Confirmed. What Regina means by 'help' is basically this:
where indeed the help entry for 'Ignore system input language' is lacking.
Description in config schema would be good as help text.
Andras Timar committed a patch related to this issue.
It has been pushed to "master":
fdo#59209 add help text for 'Ignore system input language'
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.