You can set an initiative to confidential from within the initiative itself. Click on the 3-dot menu located at the top right of the initiative, then select Access.

A confidential idea will be displayed to users who have the following permissions:

1. A user is the owner/facilitator

2. A user is an approval stakeholder

3. A user is a super user for the initiative's org structure - this is set up similar to the process to give user access

4. A user is given specific access from the Additional Viewers or Roles section