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I want a checkbox to control privacy settings.
Checkbox to indicate that note is only accessible to the owner and administrators. For administrators to view private notes, they need the “View All Data” permission; to edit them, they need the “Modify All Data” permission.
For administrators you can enable view all and modify all data from profiles
setup->profiles->system administrators->edit->enable view all and modify all data.
you mentioned Note here I'm assuming it be a field(correct me if i'm wrong) for that you can use field level security.
Thank you,
Arpitha Reddy