Hi, I have some questions:
- If I have 160 users and they can create their custom dashboard, but I don't want to let them delete other people's dashboard.How can I do?
- Could I restrict users to use the dev tool?
- Could I modify the Kibana CSS to make a custom Kibana? such I want to hide the dev tool or "add a filter" button.
thank you in advance 
1 and 2 are not currently available in any released version of Kibana but are aggressively being worked. You can track Role Based Access Control here . Phase 3 in that issue will provide the ability to grant granular application privileges.
Kibana can be modified with plugins. You could create a hack plugin that adds custom CSS. Plugin documentation can be found here