To clear the clipboard history, follow these steps:
1.Open the clipboard history sub-menu in one of the following ways:
•On the Home tab, in the Edit group, click the arrow to the right of the
Paste button and select Paste from clipboard command from the drop-down list.
•Open the context menu by right-clicking anywhere on the slide and select Paste from Clipboard.
•When working in macOS, run the Edit > Paste from clipboard command from the command menu.
2.In the sub-menu that opens, select Clear.