Hello,
unfortunately, Alfresco Share does not provide a native configuration method to allow tenant-specific configuration. But with Surf extension module configuration it should be easy to set something up in that regards. Basically, all tenant specific configuration should go inside an extension module definition "configurations" section. That module would need to have an evaluator that checks the currently active tenant. That way, the tenant configuration is merged into the global configuration based on the current user / request context when the context relates to the tenant of choice.
Regards
Axel