Enable or disable macros
To help prevent macros that contain viruses from contaminating your system, by default Office for Mac displays a warning message whenever you try to open a document that contains a macro. This message appears regardless of whether the macro actually contains a virus. You can turn off the warning message, but if you do, make sure that you know and trust the source of the document before you open it.
On the PowerPoint menu, click Preferences.
On the toolbar, click General .
Do one of the following:
Enable macros when you open a file
Clear the Enable macro virus protection check box.
Note If you disable macro virus protection, you run the risk of infection, which could result in serious damage to your data.
See the warning message when you open a file that has a macro
Make sure that the Enable macro virus protection check box is selected.