Allow or prevent multiple masters in a presentation

1. On the Tools menu, click Options, and then click the Edit tab.
2. Under Disable new features, do one of the following:
   • To allow multiple design templates to be applied, clear the Multiple masters check box.
   • To restrict design templates to one per presentation, select the Multiple masters check box.

Note   If you have already applied more than one design template and you then disable multiple masters, no current slide masters are deleted, but any new design template you try to add will apply to all slides.