Thank you @PickleRick as per document https://docs.splunk.com/Documentation/Splunk/9.0.4/Security/Rolesandcapabilities edit_own_objects capability is already disabled for user role but still user will be able to create private dashboards in $SPLUNK_HOME/etc/users/<userhome> directory. We clean this directory manually right now. We are looking for this role as a "read-only user who can run dashboard created by other power user and run searches". A typical requirement for support team.
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