Sure,You can make it private if the room is created public(you should be a admin or your admin should have provided you the privilege).Open your HipChat in web app and in the side tab ,check for CHANGE PRIVACY option ,here you can change the privacy and click OK.
Please let me know for further queries,
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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