Accessed from the Tools menu
You can lock the model to ensure that no further changes are possible. This may useful in cases when you wish to send a model on to colleagues or clients to allow them to view inputs and run calculations but not to make any changes to the model itself.
To lock the model you must first enter a password which can be used to later to unlock it again. Please make sure to keep a note of the password when locking the model to ensure that you can unlock it again if necessary.