Synchronization is not disableable, but you can disable the synchronization of SSH passwords and keys.
To do so, Android users navigate to
Settings > Security, and toggle
Sync keys and identities off. iOS users navigate to
Settings > Synchronization and uncheck
Keys & Passwords Sync.
! We use AWS as storage and all data is stored according to the zero-knowledge principle. All information is encrypted on the client side before synchronization. The encryption key and hash are never stored remotely, so only you will be able to access your data.