I had problem to turn off the dates in Sub-Series. I update the config file by removing:
{
:property => 'dates',
:inherit_directly => false
},

remove the directory of PUI index in data folder; restart the service; re-index the records and the dates always show up as being directly inherited.

Here is the link to the github tech doc: https://archivesspace.github.io/tech-docs/architecture/public/

Directly inherit a value for a field – the record has no value for the field and you want the value in the field to display as if it were the record’s own [uncomment the inheritance section in the config, set desired field (property) to inherit_directly => true]

Indirectly inherit a value for a field – the record has no value for the field and you want to display the value from a higher level, but precede it with a note that indicates that it comes from that higher level, such as “From the collection” [uncomment the inheritance section in the config, set desired field (property) to inherit_directly => false]

Don’t display the field at all – the record has no value of its own for the field and you don’t want it to display at all [uncomment the inheritance section in the config, delete the lines for the desired field (property)]