Thanks for the help Jay, I've gone and logged into Ambari as "admin" instead of "maria_dev" (I had to root into the host VM and reset ambari password first) and made the changes from there. The default "maria_dev" profile doesn't have admin rights so I couldn't make any changes in the sandbox initially, hence the reason I had gone into /etc folder. You're right, accessing Ambari as admin makes it unnecessary to go into file structure, and it stores a log of changes made to all settings, which is an added bonus.
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