DB version: 12.1.0.2.4 (July 2015, PSU)
OS: Oracle Linux 6.6
I was trying to create a DB using DBCA. But, the drop down menu is disabled as shown below.
I tried to clicking on 'All Initialization parameters' circled in red above. But, I don't get to change the value 8 to another one

My network connectivity was a bit slow. But, I don't think that has anything to do with this issue.