Give each collection its own access
Each vault can have its own PIN or pattern. Enter the PIN or draw the pattern assigned to a vault to open that collection.
Keep your access methods distinct
Choose PINs or patterns you can reliably tell apart. Test each one while you have access and keep recovery information organized securely for the vaults you use.
Separation without sweeping promises
Different PINs or patterns help separate your experience inside the app. They do not imply that the existence of other stored vaults is impossible to detect through examination of the device.