Use compatibility mode to work with different versions of PowerPoint …
https://support.microsoft.com/en-au/office/use-compatibility-mode-to-work-with-different-versions-of-powerpoint-bc87ca23-4208-4d58-9c01-3a38a84c16e0
WEBTurn on compatibility mode. Saving your PowerPoint presentation (.pptx) as an earlier version, such as PowerPoint 97-2003 (.ppt), automatically turns on compatibility mode. Open a PowerPoint presentation. On the File tab, click Save As, and then click Browse. In the Save As dialog box, in the Save as type list, click PowerPoint 97-2003 ...
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