You have the ability to set personal preferences for your Loops. First, navigate to Settings >> Loops as shown below.
Now, you're able to make easy changes to the following:
Time increments for interview duration options
Default interview duration
Default candidate availability
Enable or disable the option to mark calendar invites private
Enable or disable the option to mute calendar invite notifications
For enabling private calendar invites, you also have the option to mark all events private by default.
Don't forget to save!