QuickBooks has a large number of warning messages that pop up when you do certain operations. You can check a box that will prevent the message from showing again. There are times, though, when you accidentally “turn off” one of these messages when you don’t want to. How do you get them back?
These are called “one time messages”. Click Edit in the main menu, then Preferences. Select General preferences and the My Preferences tab. In the upper right is a box titled “Bring back all one time messages”. Put a check in that and click “OK”. That brings back all of these messages. There isn’t a way to turn an individual message back on.