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Master template
Master Template is a slides editing feature allowing you to put the same components to all slides of the presentation at a time.
You can use it only with presentations containing this feature. It appears on the right in the top toolbar of such presentations' edit mode.
Enter the edit mode and switch the Master Template feature on.

To add exclusive components on a slide, without the Master Template feature, turn it off and keep editing. The components added while Master Template is off, will appear only on the individually edited slides.