Preserve a master

In most cases, PowerPoint will automatically delete a master if it is not used by any slides in the presentation. To prevent PowerPoint from deleting an unused master, you must preserve the master.

  • Right-click the master thumbnail preview and choose Preserve Master.
  • Click the Preserve Master button in the Slide Master View toolbar.
  • Choose Edit → Preserve Master.
A master can still be manually deleted when it is preserved.
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