Users who can edit the dashboards can also share dashboards. The following is the screenshot for users who can view, edit and share the dashboards.
If you want to remove the share option for all few set of users follow the below steps:
- Goto Administration > Roles.
- Choose the Role, the users belong to and click "Dashboard" tab.
- Under Default Permissions, uncheck "Share" option. If you do not see the "Share" option follow this article.

- Now, when the user belonging to that particular Role logins, the Share option will be grayed out.

Tip : If you want users not to share one particular dashboard: In the "Dashboard" tab, in "Custom Permissions" section click on "Add",and add the dashboard of choice and uncheck "Share".
