Multi-Undo is off warning

Question:     

On some of my schedules I get this warning.  Why is this undo off and how can I turn it back on?

 

Answer:

Some older schedules might have this feature turned off.  To turn it back on, just click Edit on the Tools tab.  Then,  Multiple Undos Capability Active for Current File and set a number of Undos (1-100)