How to Change the Measurement Unit in Microsoft PowerPoint

1. Open the Control Panel by clicking the Windows icon found at the bottom of your screen, type “Control Panel” in the Search bar, and select the “Control Panel” app in the search results.

2. The “All Control Panel Items” window will appear. Click “Region.”.

3. The Region window will appear. In the “Formats” tab, which you’ll already be in, click
“Additional Settings.”.

4. You’ll now be in the “Numbers” tab of the “Customize Format” window. Here, click the down arrow in the box next to “Measurement System,” choose the measurement system you’d like to use (the Imperial system is listed as “U.S.” here), and then click “Apply.”.

Ref: https://www.howtogeek.com/706372/how-to-change-the-measurement-unit-in-microsoft-powerpoint/